Been there for a decade or so..and the old feeling can still come back, but once you get things back on track ..you know what is real. I found all mine was coming from my thyroid and becoming diabetic..sugar!!! Yeah, it is bad and very real when it is happening, but then I started noticing..hey..I felt find 30 minutes ago..what changed??? It was the food I just ate. When things get a bit off or happening, now I know what did I eat?..do I need to eat?..do I need to get cool or hot?..should I get a bit of rest? My answer is in there somewhere usually. Oh, by the way, I don’t take any meds for anything, and never did. Now I just know to eat right etc, and taking off lots of extra weight made a biggggg difference in what was happening. Oh.. one big chemical things making me sick..was the smell of the lawnmower leaking gas in the garage!!! That only took 8 years to figure that out. Also the smell of banana peels!!! It is amazing how things change when you figure out these little things. You will do it too! Go for it!