I feel so bad for you that this has gone unanswered for so long!
Anyhow, I've got some similar things that come up during a gyn exam. This has been going on for my whole life - it involves my first memory of being alive and an instance of non-typical childhood sexual abuse, which has been repeated in medical settings. The most recent of these being during a surgery for an injury last May. The unnecessary and refused medical procedure given to me anyway (I cannot prove my refusal) caused an ongoing medical problem.
I went to a therapist after that, and was re-diagnosed with PTSD (No big surprise there!). I know what caused it, what the issues are over, and the focus was on how to deal with it so that it doesn't happen again.
I'd learned in previous therapy, and some ad-hoc discussions with others who have PTSD on how to deal with the flashbacks. Probably the most useful thing I found was what I learned from a Vietnam Veteran. Certainly the content of our flashbacks is very different, but the method I adopted from him for dealing with them was the same: Focus on something that you KNOW is in the "here and now" - TODAY. Something that did not exist when the triggering event happened. It can be something about the town or city you are in. Something about the building you are in. The presence of a person or pet that you didn't know/have back then. Today's newspaper. Focus on THAT. Realize that it's "real", it's in the here and now with you, and the content of the flashback is "just" a memory and it really cannot, in itself, hurt you now.
The things I learned in past therapy instances involving PTSD was to go over what happened (which really was not that useful), putting the blame on whoever caused the issue, realized that I was a vulnerable person in a vulnerable position and could not stop it.
In the recent therapy instance, the therapist realized that I had that down pretty good. I realized there were things in the distant past, I realized there were medical abuses that happened years ago, and I realized there were medical abuses/accidents/miscommunications that happened recently. Our focus was on preventing them from happening yet again.
To start with, make out an advanced directive, in accordance with your own state or other jurisdiction, which describes the medical procedures that you will or will not accept under particular instances. Some of these you may not have thought about before, but they are quite important for you to describe what you want BEFORE it becomes an issue.
When you go to a doctor or hospital, they have you sign a consent form for treatment. READ the consent form. If the person behind the desk belittles you saying, "It's just a standard consent form.", reply that you do not sign any legal documents without first reading them, and that it is NOT standard for YOU. You may put in other items in that consent form, or withholding consent for particular procedures. If there are things you will not consent to having done, write "I specifically withhold consent for (treatment or procedure)." They may try to talk you out of it, or tell you that you can't do that, but hold your ground. It IS your right! Give them a copy of your advance directive too. Also, keep it on your person in case you are in an accident and taken for medical treatment in another city. Even if you are out of state, it still tells them what you consent to, which they will heed if they are at all ethical. Another thing is to send a copy to your insurance company. They don't want to pay for procedures that you refuse! They will then not approve payment for these, and no doctor or hospital will do anything which they will not be paid for.
Another thing, when you do see a doctor for ANY reason, take someone you trust with you. Have your OWN witness to what was said, done, what happened. In the best of circumstances, they will serve as an adjunct to your own memory on what the doctor said, told you to do, how to take a medication, when to come back, or whatever. If anything does happen outside of your consent, have your ducks in a row to make a case. If you will be anesthetised for surgery, write on your body any refusals you have, and take a picture of that refusal along with your wristband, and that day's newspaper (to certify the date). If you find that an unwanted/refused procedure was performed, take pictures of THAT evidence, along with the written-on-your-body refusal, newspaper, and wristband. Have a trusted friend or relative there with a camera cell phone.
You're far from the only one with problems with GYN care. I had them too after the medical abuse that happened to me years ago. I started researching, trying to talk myself into going for them. You know what? I found that they really can't find much in a "well woman" pelvic examination that there are not already better diagnostic tests for. Cervical cancer is a rare cancer. Pap smears can screen for it, and it has a high false-positive and a high false-negative rate. A CSA blood test is far more accurate. Pap tests lead to biopsies which can lead to other invasive tests, and culminate in a hysterectomy. All of these have risks, which cumulatively are higher than dying of cervical cancer. For me, a gyn exam is not worth the risk or the mental trauma. Heart disease is the #1 killer of women, and tests for heart problems are downplayed or not often done. Lung cancer is a killer of many, but rarely are chest X-rays performed. Skin cancer is well up there too. Please read this article from the Harvard Journal of Law and Gender, written by a woman who argues against women being forced or coerced into pelvic exams.
http://www.law.harvard.edu/students/orgs/jlg/vol27/dixon.php