You mentioned the possibility of MS - did they do an MRI of your head AND your neck? The lumbar puncture can be very useful for lots of neuromuscular issues - MS, CIDP/GBS, paraneoplastic causes.. lyme, and more.. I think they took 22cc's of spinal fluid from me when I was in the hospital, and they didnt' have enough to run all the tests, since there are so many they can run! I have been sick for almost 3 years now and they still think of tests to add that we haven't run - its kind of crazy!