Topamax and oddly

This was a new one for me. I have been on Topamax for about 10 weeks, and I'm taking 50 mg in the morning, and50 mg before bed. I get the usual side effects, tingling in hands and feet and soda tastes bad, I don't have ANY problems sleeping, but I have no energy. Anyway, today I was working out, I did about 15 minutes at a real easy pace on the elliptical trainer and I felt really sluggish, so I tried to run on the treadmill. I ran 1 mile at a 12 minute pace (which for me is a challenge) and I was so HOT I had to stop. I was burning up, but oddly, I was NOT SWEATING--at ALL. My skin was hot to the touch and bright red. I was probably very close to heat stroke. Make sure if you are on this medication, especially if you exercise, that you drink plenty of water. This has never happened before and I work out regularly, but it really scared the heck out of me.