Im ruining my life!!

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My story begins about 6 years ago when i was still a teenager.
I smoked weed occasionally but as time went on i found that i was becoming addicted to it (inb4 weed isnt addictive). It went from me having minor withdrawals and only "needing" it once a week (i say needing but i know it doesnt have physical addictive properties) to smoking it daily just to get by. It didnt help that i was living with dealers and selling it myself from time to time.
Anyway fast forward to about 4 years ago when i started dating my now ex girlfriend. I got her into smoking daily and eventually she became abusive without it and basically wouldnt let me sleep (good thing i didnt have a job at the time). I left her at the beginning of last year and I struggled to stop smoking so suddenly as i had to move back in with my parents and i didnt want to get caught smoking it at their house for fear of being kicked out.
Thats when i turned to alcohol. In the beginning i would only drink to help me sleep. I still had massive cravings for bud, but if i drank enough, I would get to sleep just fine.
I got back into smoking pot while still at my parents because my paranoia went away seeing as i stopped smoking so much and i had a dealer friend I would help out trimming buds to make some money (or free weed) and soon found i was addicted to it again.
Recently this friend has been busted and no longer does that so ive had to use actual money to start buying it again but i realised just how expensive it is seeing as im spending upwards of $300 a week on booze. But to top it all off, ive also managed to become addicted to prescription drugs. I feel the only way to get over this is to be locked in a room for 3 weeks with only the essentials and i dont have money for therapy or rehab.

Tldr: is there a quick fix for addiction that doesnt require much money or affect my job?