The adrenals are in charge of your stress "system" and if they're stressed too much they get "shot." The adrenals are "physical" too so a problem with them is a physical malady.

Have you had a full physical and blood tests, etc. and there's nothing your GP can do? There's lots of "types" of stress and most of them are not under our conscious control anymore than breathing or digestion, etc. are. Daily living situations/stress are/can be "minor" if the dominoes :-) inside start toppling. While there's always more we can do to "help" ourselves, we often can't totally fix things, that's up to what's broken and how it's broken, etc. Just "reversing" bad things, eating better and exercising, for example to lose weight, are no guarantees that that will happen the way we "expect." I was watching a show on TV last night and a woman was doing everything very "right" and to the hilt to lose weight; the physical trainer had her working hard and she was, she ate right, etc. but the weight wasn't coming off as it "should". Turned out she'd had gastric bypass surgery 6 years earlier and with those, apparently there's a lot of messes up your thyroid and she had low thyroid as a result is why nothing worked even though she had to work hard just to stay "in place." She and her mother were very disappointed, were thinking if it it had been possible to know that 10 years earlier before the gastric bypass (that there was a high incident of low thyroid as a result), they might have done things differently.

Here's a good British site I found: http://www.managingstress.com/articles/physiology.htm

Good luck with finding things to help you.