Welcome name
Marijuana actually ended up making me more depressed...so I think you're wise to want to stop it, and any other self medicating you're doing.
I don't know why you stopped taking the meds, but personally I think the best advice anyone can give you is to go see a reputable doctor or counsellor about your depression, and you can also ask about ideas and ways to deal with your history of addiction.
Supports important too - you'll find a lot of support here but have you ever thought of face to face support groups - like AA SMART etc - as well?
D