Welcome Jane. At the very top of the newcomers list is a thread about books on recovery and spirituality. You might find one you like there.
Regarding friends, I would just tell them that drinking is not agreeing with you. If they press for more specifics I would be inclined to be honest and tell them the truth. If nobody understands (or even if they do) go to an AA meeting
. At least see what meetings are like by going to a few.
It’s my understanding that when a person quits smoking their metabolism changes. Your system is going through some major changes. so give it time to adjust. All the best to you.