I'm not a doctor so take my opinion for the free advice it is.
However, I'm a journalist and researched this issue extensively and some research suggests MS can be caused by parasites. I wonder if the symptoms caused by parasite if they go into your brain mimic MS.
Regardless, I would work aggressively with an MD to identify what is going on as if you do get pregnant these parasite can attack the fetus and cause major birth defects ad even fetal death. In fact, I would consider delaying fertility treatments until you sort out what is going on.
My heart goes out to you. I hope you get well soon.