No, I didn't have high-adrenaline situations before developing ME/CFS.
I'd had a few of course, in the distant past.
When I developed ME/CFS I was living a steady, pretty boring ordinary non-stress kind of life, retired, no issues, plus a healthy enough immune system.
I just happened one day to be in the vicinity of someone who was coughing some sort of virus over a queue in a store. That virus was my nemesis. It just never -ever- went away.
However, I have noticed I do get unusual adrenaline-type reactions to the mildest stress now. Sometimes (especially in the first year or so ) even the stress of digesting food would cause an adrenaline surge. Or getting up in the morning! (yuck to that one.)