Dear Blake:
Welcome back. Caffeine is physically addictive, so it is not all in your head, as you suggested. There is a lot of literature on the matter.
Personally I didn’t drink coffee before my forties (an anomality, I imagine). I was very anxious way before I drank coffee, while not on any stimulant drugs of any kind. Currently I am calmer than I was before in my life and I am drinking coffee, although not in the afternoons, mornings only, and quite a lot of it.
I was wondering, if you would like to share, if you are still living with your mother?
anita