I think it’s possible you are preparing yourself for a diagnosis that is relatively unlikely.
Many people post on here that they fear their symptoms are pointing towards MS. Or even that they are certain their symptoms mean they have MS.
Clearly the doctor(s) you’ve seen suspect ‘something’ neurological, but you can’t expect MS until the fat doctor has sung the words. Or something to that effect.
I’m not trying to downplay the symptoms you are suffering. Certainly there is something not right and hopefully the MRI will show the neurologists what that something is. I hope for your sake that it’s diagnosed as a malady that’s resolveable rather than MS or worse.
Supposing it is MS though, these days there are countless disease modifying drugs which aim to reduce the number and severity of relapses. This means once your current symptoms resolve (and by far the greatest number of people with MS have the variety that comes in waves, or relapses followed by complete or at least partial remission), you’ll be able to take a drug to reduce further occurrences. This in turn would make future disability less likely and/or less severe.
Honestly, MS isn’t a life shortener, nor does it herald death, definite disability or wheelchair use. Which is I know the kinds of fears someone in your position can’t help but have.
I hope the MRI and neurology appointments come very soon and then that you get answers to what’s affecting you ASAP.
Do repost on here for help with symptoms, information about what is afflicting you or just empathy regarding your worries.
Let us know what symptoms you have and we’ll try to help.