You are not alone man... I know that feeling when you feel like you've been numbing yourself for so long, only to have it all catch up with you at once. You feel a bit crazy because it feels like your cycling through amplified emotions. I remember when I stopped smoking weed and messing with pills, I didn't feel right for like three months. Honestly, for me, the best thing to do was to look to the future and occupy myself "with positive" activities like exercise, reading, online courses whatever I could do to keep my mind occupied, and over time I gradually began feeling somewhat normal again.
I'd stay motivated by telling myself that what I do today is what tomorrow is going to based on, not necessarily what happened yesterday or before that. Oh yeah and that book "the power of habit", really changed my whole perspective on everything, it made me understand that people are resilient and they really can change things for themselves. Whatever you do, don't give up on yourself.