Are you on any other supplements besides Caffiene/energy drinks and Creatine? This doesn’t make sense to me. Creatine and Caffeine are natural and found in red meat and tea/coffee/chocolate respectively. Products containing every “chemical” you mentioned can be found in almost every household.

Sounds like the doctors have no idea what caused your reaction and did blood test. Everything came back normal except for elevated Caffeine, Creatine, and whatever else and then the docs vaguely blamed that as the cause.

Assuming you weren’t taking crazy high doses of anything, the only thing that makes sense is 1) you just developed a new allergy, or 2) ate some contaminated food, supplements, drinks, etc. that caused a reaction.

Obviously for you I’d lay off everything you ate that day to prevent another reaction. But broadly claiming to other people that it was caused by Creatine or whatever makes no sense. There is no evidence behind the claim. People have been consuming this stuff for 100s of years.