I know you are very scared right now. And it's easy for me to say try not to worry. But, my sister who is 52 was having very similar experiences to yours and the neuro she went to was almost certain it was ms, especially since I had been dx with it. But much to his surprise after doing all the testing, there was nothing to support it. So he began treating the indivdiual sx. and she is doing much better now.
It is a very scary thing. And you are smart to seek good ms doctors so they can get to the bottom of it. Then hopefully they will be able to get you on an appropriate treatment.
There are a lot of knowledgeable and caring people here at NT. So I hope you can get the comfort you need to help you get through this time. I wish you the best.