Sorry to hear you are not feeling well.
If your tests come back negative, you can still manage symptoms with your primary care doctor. I hope you are doing that anyway, since MS treatments don't help with symptoms, they only supposedly slow down the disease.
If your tests come back negative, either you don't have MS which is good news, or it doesn't show up yet. Earlier disease sometimes doesn't show up, then later it can. Also some mri machines are stronger and some are weaker, so if you were tested on a 1.5 machine you can go find a 3 machine. (3 is stronger. )
Unfortunately, now that you are walking down the might be ms road, uncertainty is the experience. That will be true whether your tests come back positive or negative. I really hope you don't have ms and that your symptoms are caused by something much milder. But, I know what it is like to know something is wrong and want a diagnosis because of not being believed. Not fun.
I wish you the best, and I'm sorry you are in this situation.