Hi Jules--The first neurologist I saw, back in '97, said lesions don't always mean MS--I had only had one potential symptom at the time, so he said it was possible, but that he seriously doubted that I had MS. Later found out that I did. But clinical symptoms are a factor in the diagnosis as well.
Definitely get a second opinion--look online for neurologists in your area, or even call your old doctor's office and see if someone there will give you a referral.
There are so many knowledgeable people on this forum, who will have better advice than me! Good luck to you, and don't give up until you find out what you need to know! Hopefully all will be well.