Hi Synnove

. Yes, it could be MS. That's the short answer. Getting
a MS DX, for some, is not an easy or quick journey. The fact that
demyelinating lesions were found and confirmed on your brain MRI,
is certainly an indication of MS, but not total proof.
Have you seen a Neuro, who specializes in MS? This may be the
thing to do. Get yourself to a MS specialist/clinic. Maybe then
you can get your answer?
Keep us informed as to how you are doing and hang in here.