Hi Franz, hopefully I'm not too late to reach out to you.
While you've remaine sober for 3 months were you in any type of program? Something to help sort out the kinks?
If not, that's considered a dry drunk. Meaning you've never worked on or gathered the tools to remain sober.
I'd suggest finding program, for a lot of people it's AA, while others have chosen another path, either way working on you from the inside out is very important to any recovery.
I wish you the best, you can be sober and have a happy life. It just takes work, if it were easy, this forum wouldn't be here.