Congrats on your 4 months!
Reading about what you did to get sober if very impressive. I'm also an AA'er so I think it's great you're in the program.
Look, you're not always going to feel great. That's not specific to alcoholism, drug addiction, AA, being sober or any of that.
That's life.
That's what every single human being that has ever walked this earth has felt. Ups and downs, triumphs and failures, wins and losses.
Heck, you might even wake up tomorrow and feel ok again. My advice to you is put in even more work into your sobriety and go help someone else.
Helping someone else works every time. Every time.
Pick your head up. You're in recovery. You're a walking, talking miracle. Keep putting that to good use.
You have MUCH to be grateful for.
Kjell