Hi guys, I'm from england where black tea is the main beverage drunk. Anyway I tried drinking water and a few cups of coffee yesterday, I felt horrible, depressed, anxious, tinnitus was bothering me a lot more. Today I went back to drinking black tea (with milk, 1 sugar), instantly I felt more relaxed, happier, just more chilled out. I did some research and apparently black tea contains theanine, theanine increases the alpha waves in the brain putting you in a relaxed yet alert state, I know tea contains caffeine but the theanine balances it out leaving you more relaxed, there was also a study done saying tea is as hydrating as water, i drink about 6 cups a day, its a great stress reliever, we British build an empire on it! Ditch the coffee and give tea a try, it might help.