I can appreciate your experiences because I've been there, done that. It looks like one of the things you missed was re-tubing a coal fired boiler and breathing in all that fly ash that's left over from the burned coal dust. It's everywhere and you can't avoid it. When it encounters moisture, it turns into hydrogen sulfide. If you're sweating, which you are, it eats up your clothes. About two weeks life expectancy for a new Wrangler shirt and jeans. Imagine what it does to your lungs. As far as the " foot literally on fire " thing, I never wore lace up boots on a job just for that reason. I've never worn anything but Red Wing Pecos boots. You get a hot one in your boot, it's easy to kick off.