Not trying to be a downer, but, the chances of you coming out of this unscathed aren't good. Regardless of whether the accident was your fault, you were caught driving under the influence and you had pot and an open container in the car with you. At the very least, your license will most probably be suspended for a time and you could still face charges of DUI and possession.
You can still turn your life around and it sounds like you have good reason to do so. Good luck.