I've been self-medicating ADHD with multiple cups of coffee a day since I was 17. I'm in my early 30s now, and after getting on Vyvanse, have reduced then given up coffee. I realised that coffee was the reason for my anxiety which builds up towards the end of the day.
I reduced my coffee down to 1 espresso per day two months ago, and quit entirely two weeks ago. I'm still on stimulants, but Vyvanse treats ADHD much better and has fewer side-effects.
Same here, my afternoon anxiety from daily coffee consumption (1-2 cups typically) got really bad on some days. I was heavily addicted to coffee and nicotine for years but I managed to quit both of those after realizing that they weren't doing me any favors. I continued to have cravings until I got on ADHD medication then they practically disappeared overnight and never came back.
I think more people should give green or black tea a try, I found them to provide similar effects to coffee but with fewer side effects.
I'm basically a vampire now.