In 5 months it will be 30 years since I quit drinking and I experienced the same things when I quit. I was a very experienced bar attender. I went out every night and came home at closing time. When I met the nice man with the blue lights on his car I blew a .27 for his enjoyment. That was the last time I had a drink except for the champagne toast at a couple weddings, a retirement party and an anniversary party. I HATE champagne!!!!
One night a week or two after I quit, my wife and I stopped at the old watering hole after a movie. She didn't quit drinking, I did. That is when I realized that part of my life was over and most of those guys at the bar who WERE my friends were strangers now. The main reason I felt I lost my friends was because for many years my only friends were the people I met every night at the bar.
About all I can say is keep on keeping on. It does get better and you basically begin a new life and make new friends but you may keep a few old ones, I did. Some of those guys accepted the fact that I quit and one of them was actually proud of it. If we happened to meet in a social situation he would introduce me as "this is XXXXX, he quit drinking." Six months later I quit smoking and he was happy to add "he quit smoking". His father died of lung cancer and he was really happy that I quit smoking.
At this point I can't stand to hang around someone who is drinking or someone who is hung over. You CAN smell it. Strangely I don't feel the same about someone smoking (tobacco). I don't mind the smell of a smoker sitting next to me in a diner and it doesn't bother me if they are smoking around me, except for the smell on my clothing the next day. When I go into the house of a smoker I AM glad my house doesn't smell like that but I don't care if theirs does.
I have never had any desire to drink or smoke again. Lucky, I guess. I have a cousin who quit smoking about as long ago as me and he wants a cigarette whenever he's awake.
For me it's just great to not be doing it any more. Not because I feel superior that I quit but just because I don't do it. So don't give up.