I have, I think, found a solution (suggested to me yesterday in the "Too Hot to Exercise!" thread by DiabetesCanKissMyButt.
I have to eat first. I can't exercise on an empty stomach and still avoid a spike.
I just did a ten-minute intense strength training session about a half hour after finishing eating. My sugars went down! Always before, they've gone up 20 to 40 points. This is amazing. Tomorrow I'll find out if it works equally well for cardio. If it does, I'm in clover.
I didn't get nauseated this time, either, and I always have before when I've eaten prior to exercise.
I also wonder: could my intake of coconut oil have something to do with both the lack of nausea and the lowered sugars after exercise? Because that's really the only change I've made since the last time I tried this. Thoughts, experiences?