I don't drink alcohol and never have, it just doesn't appeal to me- but I'm not so quick to tell you not to drink alcohol. Do you have a history of substance/alcohol abuse? If not, if a glass of wine now and then helps you feel calmer it's not the end of the world. If you're looking forward to getting home and being alone so you can drink every night well, obviously that is a problem.

Good for you for donating blood - and Happy Birthday!

I'm going to hazard a guess and say that the fall-out with your friend is contributing a lot to your upset state of mind.