Hi @snow I think I just saw yesterday that the average diagnosis of MS takes 4 years! crazy. Thankfully mine was quickly diagnosed when I had an obvious symptom (foot sticking out at a crazy angle) but several years before that I had weeks of a strange issue that I now recognize as foot drop but was thought to be caused from a pinched nerve due to a kick-boxing exercise class.
I think Dr Boster had a good video on diagnosis https://www.youtube.com/watch?v=0csvVXatlFo&t=11s
As for me the most troubling lesions are on my spine although I also have brain lesions. If they have only checked the brain they may need to extend the scan. Also keep in mind that there are other diseases that can have lesions and others that mimic MS…so diagnosis can be tricky.