I'm sorry you found out more disturbing news (the 7 spots). And I'm sorry you have to undergo a spinal tap, but it sounds like the doctor is being thorough, and wants to be sure to rule out all other possibilities.
It could be of course that you have more than one thing going on...but I hope the doctor can settle on just one diagnosis and course of treatment. As tough as it is to be diagnosed with some autoimmune disease, it's a lot easier if it's just one, and not more than one thing!
Good luck with your spinal. If you're going to the hospital, I'm sure they'll take good care of you, both before, and with advice about what to do when you go home.
Let us know how it goes!