Hi. I'm female, age 68, still working full time, living in my own home, dealing with recently diagnosed prediabetes and migraines. I eat smart but I don't have a regular exercise program (Yes, I know.). Today (partly cloudy, 72 degrees, lovely day) I spent about 30 minutes with the weed eater. Came in for large glass of water, decided to sit down for about 15 minutes. When I stood up, nearly went down again, very lightheaded, had to blink a couple of times to clear my vision, instant headache, staggered back to chair. Grabbed can of pop, ate some fruit and some cheese. Left arm shaking (that's happened before with weed eater). Waited half hour, tried again, still a bit dizzy but better, vision better. Probably low blood sugar, right?