I'm so sorry to read about this flare, and I do hope the 'roids give you some relief.

You mentioned brain lesions and an unco-operative leg. Did your neuro do a spinal MRI as well to check for spinal lesions, in view of your leg problems? I've only had one spinal MRI, but it shows the lesions that have caused the troubles with my legs, even the original exacerbation over 30 years ago.

I'll keep you in my prayers in the hope that this eases quickly for you. Please keep us up to date as to how you're managing.