Sorry to hear of your myriad of symptoms, but your doctors might be as lost as you are for the moment. Trouble is, you can have MS with a negative spinal tap (only works sussing out about 80-90% of the population). And you can have lesions in the brain and spine without having MS. Unfortunately it's not one of those: if it looks like a duck and quacks like a duck... Disorders. And short of passing/failing tests with flying colors so to speak, it's not a quick dx, and realistically even if you do show signs, have positive tests, it could still take them a bit to make the call.

I hope they find answers for you soon,but I also hope you don't get to discouraged if it takes them a bit. But this is also a great site, everyone has been great to me while I was waiting for confirmation. So please don't hesitate to join in the fun and vent if you need to, we'll be here.