Hello. I am sorry that you are going through all this. First, I would try to get second opinions. I will tell you though that I have suffered from PTSD, more than once. Any tramatic event can cause it. I know what it is like to feel helpless and alone. I do myself right now. I had to have my cat euthanized in February, I am a caregiver for my mom, and things are going on with her that are making me scared. My cat was the glue that held me together. I cry all the time. I have headaches, nausea, no appetite, I am nervous all the time,( what else is new), tired all the time, have body aches and pains, pace back and forth ..and it goes on. I know you feel alone, and for the same reason is why I came here. I feel bad that you feel this way, because I know it all too well, and it really hurts. It is a vicious cycle. If you do not believe your doctors, then get more opinions, but after that, if they all agree, then you know what it is. Do not torture yourself. I have been doing this for 20 years on and off. I really hope you get well soon.