Mine has changed since diagnosis. At first, it affected my eyes, but I had an attack of ON in the right, then left eye. Vision would get blurry until I cooled off.

Later, it didn't bother by eyes, but my legs, instead. My legs would become shaky and weak.

Tracking the pattern over the past few years, I've found that the parts of my body affected most recently by MS are the places where the heat bothers it the most. It is most often weakness which happens until I'm cool.