Hey Jeny,
I did the same thing with my first child!! I was the same way 190ish/130-140. It was crazy. They took my first born three weeks early.
I am not diagnosing you of course, but you really do have my same symptoms. I don't have the arm thing but my presenting symptom was vertigo and balance problems. I have had the vertigo ever since although to varying degrees. As long as I am not nauseous I can function with it. You get your "sea legs" after a while. Weird.
No, not everyone is doomed to go on disability with MS. I am not really sure but I have heard that the numbers are right around 50 percent. I am still working full time. We have other member that also work full time.
The lumbar puncture is not a lot of fun but if the doctor recommends it, I would go ahead with that. It is a really good indicator. As that they use real time flouroscopy so that they can see exactly what they are doing. Just talk them through it. Don't try to tough it out. Ask about the blood patch too which can help with pain management after. I did not have any problems after it was over, the procedure itself was a bit painful but I did get through it. My doc was slow and patient and listened to me.
Jeny, feel free to ask as many questions as you would like. I understand that need to know what is possibly up around the bend. You must be a bit of a control freak like me. I wanted to know everything!!!