I am confused as well. Yeah, my symptoms started when I stopped both of them at the same time. Ritalin (10-20 mg a day), for around 2 years, been a certified coffee fiend for around 10. I also had a pretty much all day drip of diet iced-tea.
It may have been possible? It is one of my theories, but anything with Dysautonmia it is super super hard to tell. I had a super stressful episode that coincided with "the withdraw"... I thought I was getting covid. So I stopped these both cold turkey.. I am in super good shape, low carb and have never been dehydrated in years. WAS in super good mental/physical shape. Never had any type of reaction like that before and I surely have stopped them for a day or two at a time. Could have added to the stress? Did the stress cause it in a PTSD type ? Did I have it previously? Did I down regulate my NET transporters enough to do some epigenetic mutation? Is that even possible? No clue.