I've been having this problem for years now. If I do anything that utilizes my arms for several minutes, they ache very badly for hours afterward. It can be doing laundry; or this morning - simply putting air in my car tires. I can use my hands constantly. I used to think that this was due to lack of strength, but I'm surprisingly strong, according to my once-personal trainer. I can lift a lot of weight. But it's not weight that makes my arms hurt - it's simply using the entire arm versus the hand. And the heat intolerance is just getting worse. Once I'm hot, I tend to stay hot and to pour sweat. I have to literally cover myself with ice and lie down. I'm not menopausal.... Anyone else with similar symptoms?