i have never heard of that, might not be an eds thing

this definitely is not an EDS thing. I would have to guess that you just experience more side effects to the medication. I can’t believe your doctor would say that to you! I hate when doctors shut down patient symptoms as hallucinations is a clear side effect of bynadryl (not sure about tylenol) experienced by some. It could also be a reaction of mixing two medications together! If you’re on any other meds, check to see if they interact with tylenol or bynadryl

I don't believe that's an eds thing.

Do you take any other medications that could be interacting with the Benadryl/Tylenol?

It's more a liver thing. Some people are more sensitive to medications and some people less sensitive. Sounds like your liver is processing it in a way where you are intaking more of the dose than most other people. Lower the dose you take and you'll likely have better results.