Hi and welcome Arpretty!
I wasn't addicted to any other drug so I can only talk about the effects it had on me when I stopped drinking.
If I remember correctly, I was extremely tired for a few weeks. I had no energy at all and the first week or two I had bad headaches and nausea. But the symptoms are very different from person to person. Fatigue and headaches aren't unusual though. If it doesn't get better and you're worried I'd always recommend talking to a doctor though
And congratulations on your progress, quitting all those things! You're very strong, keep going!