i feel for you. it's very difficult to know something is wrong and not be able to find it, or for your drs to find it.

sometimes with MS it may take a few yrs for lesions to show up on an mri.
i would start a sx (symptom) journal. that way you can document dates and sx's for your dr.

you may have to wait 6 mos before they want to do another mri.
i'd see what your dr recommends.

you might also consider some short term counseling. that may help you deal with the stress of waiting.

try to make some kind of plan of action. like journaling, retests in 6 mos etc.
if you have a good friend to confide in that might help. for me, having a plan of action helped me overcome some fears. anxiety can make MS worse.

stay with us and we'll try to help you thru it. it helps to have someone to talk to.