Don't get me wrong, I think you warrant a work up but there are a few things about your story that lead me away from anything bad. First you are a young female. Nothing you said makes me think a**. I would totally get that out of your head. I try to be real with people on here and let them know when their concerns are warranted. In my opinion your age, sex, and diversity of symptoms coupled with an anxiety disorder truly point towards a somatization disorder. MS doesn't generally look like what you are experiencing. It's almost like you got hit with a sledge hammer of multisystem problems that have little to no (on the surface) connection to each other. While I don't think you have MS, it can't be taken off the table without a clean MRI. You are going to need that for peace of mind. IMO, I would skip the EMG as I see nothing in your story to indicate need. That would change if you had a problematic neuro exam.
I would get a thorough work up as indicated by your physicians. Then when you are cleared I would go see a therapist. It's going to be tough to convince yourself that you are healthy. I know because I deal with the same kinds of stuff you deal with when I am really anxious. I have had so many odd symptoms and despite my training could never figure out what was wrong with me until I accepted that I have an anxiety disorder which manifests itself in physical symptoms. When you feel these symptoms slow down your breathing...deep breaths in and out 8 seconds in 8 seconds out. Do some meditation, yoga, get out of the house, walk in the woods, pray, go to church, see a therapist, play with a dog, help someone else...anything but getting on google, playing doctor and staying in your head. It took you time to dig this hole, so it will take time to dig you out. Be patient with yourself and tell yourself that you are healthy. But, I promise if you do the work on dealing with anxiety you will feel better.