I too am a long time tea drinker. I stopped last year and didn't start up again till 3 or so months ago. When I got the first case, I would only drink one cup per day, and would be extremely 'affected' , pinpoint pupils, massive euphoria, lots of itching. The next case, I was drinking two cups per day and not even really getting high anymore, and I needed to add hydrocodone or tramadol if I wanted an extra push. Now, I drink up to 3 dark and bitter cups QD, and have to wake up early in the morning because withdrawal starts , now, at 8 hours. This is as far as I want to get in my tolerance, so I am substituting with another stronger opioid because I ran out early.
My point, you are not alone.