A few years ago, I had a full-on coffee/caffeine 'problem' - I'd make it like treacle, at least 1 large mug every hour (plus 2 cans of Red Bull in the afternoon). I decided to go 'cold turkey' and just have the one mug first thing, then drink water (with maybe one or two teas) for the rest of the day. Weirdly, although I was practically asleep for the first few days, after a week I was actually a LOT more alert, energised and invigorated than I was with my regular stim hits.
I find that now, 'proper' teas (like Lapsang or Chai) have an incredibly mellowing effect on me, and I tend to drink them when I feel like I need a coffee. I just can't get on with herbal or fruit teas - they just congeal at the bottom of my stomach and make me feel a bit sick.
had a guy round my house a while ago (salesman) and I asked if he wanted a coffee or tea. he explained he had a problem similar to yours and gave him self a heart attack, young guy too
my karma ran over my dogma
"Life is a mixture of fate, chance and magic"