Hi there I am also a Mother and going though the same thing, I have been in a wheelchair for the past 2 months and they cant tell me why. Life as i knew it is over I feel Like I have lost so much. I am not scared to have MS though. You shouldnt be either, there are meds now out there to help aand knowing is way better then not knowing. MRI's are nothing to worry about I fall asleep in them.
Look at it this way If you have MS at least they will find it and you can get on meds before it gets worse. Hang in there and know that you are not alone. Read my post and see what I have been going though, so I understand.