I'm so sorry you're facing all these health challenges at this time in your life. I know you've gotten lots of answers already, but I wanted to weigh in on the lumbar puncture and to mention one other thing. Lumbar puncture is not nearly as awful as it sounds. You will feel a good pinch, and you'll have to stay quiet for a while the puncture heals, maybe eight or ten hours. But it's not particularly painful, and a nurse held my hand when I got one! It's okay to be scared, but it's not very scary. The other thing I wanted to mention is that ordinarily, MS is a diagnosis of elimination. A lot of the tests are given to make sure you don't have one of the other diseases that presents like MS with similar symptoms. It took three years for me to get a diagnosis, back when I first got sick in 1978. There weren't any MRIs at that time! But you still have to eliminate the other possiblities, and that can take time. The best thing about trying to get a diagnosis these days is that unlike 1978, once you have the diagnosis there are tons of things you can do to manage the disease, like using a disease modifying therapy! And the very old fashioned therapy that I use, copaxone, has essentially stopped the disease process. I haven't had an exacerbation in fifteen years. I still have the damage I insurred in the first twenty two years I had MS, and it's a pain in the ass, but it isn't damaging my central nervous system any more.
My only advice is to leearn asa much as you can and to be patient. The diagnostic process grinds slowly, but it grinds exceedingly fine. Hang in there, and visit us early and often. This is agreat community!