First, let me say over the years I've learned a lot from this forum. Thanks to everyone for all the great posts.
I've been a clyde-commuter for 18.5 years now. 41,000 miles so far. For the last 12 years I've had an increasing problem with what I thought was hypoglycemia. I would bonk at the drop of a hat. Heat kills me. I get heat stroke just thinking about a hot day.
Well, twelve years of wondering what broke finally came to an end. It's such a simple solution for me I thought I'd pass it on and hope it helps someone else:
My symptoms (or things I've noticed about how I feel):
1) I sweat way more than the average person. I drink tons.
2) I get heat stroke easier and easier as the years go by. It seems like the more I drink the easier I get it.
3) I seem to always have that brain-fuzzy bonk feeling. It seemed like my blood sugar was always out of whack.
4) Loads of muscle twitches. Drove me crazy.
5) Muscle cramps everywhere, and I do mean everywhere - places that shouldn't cramp because you can't uncramp them when they do
6) Tired all the time.
7) I also am experiencing low blood pressure. When I stand up I just about black out.
It occurred to me the symptoms are worse as the heat of the summer really comes on. By late summer I'm toast. I starting thinking about sweat. I started wondering if I was low in sodium or maybe potassium. I decided Morton Lite salt is cheap so I got some and took 1/8 tsp per day (it has sodium and potassium). After two days all my symptoms cleared up. Every last one of them. Twelve years seems fixed overnight. It has been two months now and I'm still humming right along. No muscle cramps, no twitches, brain is working great. I've dropped to about 1/10 a tsp and I'm still working just fine.
I've been trying give myself heat stroke (working the yard at noon for two or three hours) and I'm back to my old self - no heat sensitivity.
From a few hours with google it seems sodium, heat stress, and blood sugar are all related.
Anyway, if you sweat like crazy it might be something to think about.