Hi Daphne, welcome back home.

I'm not a Doc and I don't play one on TV, but it's been my experience that MS fatigue is the usual culprit with cognative problems. In the summertime, heat causes fatigue, among other symptoms, and fatigue leads to brain fog (cognative)

I don't have MRIs anymore, but then, I've had MS for a loooong time and to me, after you have been DXed, MRIs are a waste of time and money. But you don't have a definate DX yet, so it's up to you, if you feel the need and you think it will help the Doc. to give you a definate DX and get you on some meds.

I hope you feel better soon and good luck with your decision.

((((((Daphne)))))))