You know, that chart made a lot of sense to me, even as someone with no scientific background. Almost every weird symptom I have had in my adult life was on there... after my debacle three years ago, with no real resolution (yea tell me I have fibromyalgia because there's nothing else to say), I realized after looking at the chart, that I do know I have allergies and asthma. And all the stomach issues, skin issues, rashes, hives, palpitations, blah, blah, blah are caused either by stress, which induces a histamine response, or some some environmental trigger that switches from year to year. If I treat the allergies and keep the stress down, I am healthy.
When I was around 34-35, I started having the palpitations, followed by a long bout of asthma and hives. I went from specialist to specialist, with little resolution. When the stress went away (I quit teaching aerobics 7 days a week, moved across the country, and got away from the dust in AZ) most of it went away for years. I know that a certain level of exercise, which is basically over training for me also induces these symptoms, even without any asthma showing up.

Thanks!