Spryte, I'm having similar symptoms. I'm not an alcoholic but went through a period of heavier drinking for just over a year. It's been 4 months since I touched a drop and I still get the tightness in my chest, coupled with back and shoulder ache. I have more days without these feelings now, but they still come and go. You say you had yours 3 months in, did they stop after that??
As I'm not an alcoholic, is there any chance I can get back to occasionally drinking alcohol as I did before, or have I damaged myself somehow????
I can't understand why they are termed anxiety symptoms, when I'm not even bloody anxious!!!