It's a good thing you're trying to quit(obviously), it's indeed best that you quit both drinking and drugs cause if you use drugs these two are closely related how many times did you tell yourself I'm not gonna get charlie and after you're pissed drunk you're on your way to some "friend"...believe me I know what you're talking about
For the returning of emotions which you haven't had in a while it's also a normal thing but one of the hardest things to deal with, drugs make you heartless(to say it bluntly) and the return of your heart doesn't go without the accompanied pain. One thing that helped me a lot was focusing on my physical health I started working out, doing muay thai again etc.etc. But you'll have to find your own way in this but I'm sure you'll make it in the end( no one does it right the first time and maybe never 100% remember that also). But every step in the right direction is one step further from the wrong direction.
Drop me an email if you care to discuss this further my friend!
Good luck and take care!!!