Ender,
You relapsed. You used drugs. You drank alcohol. So what?
You see, there is one addiction that we fail to notice we have, because everyone has it. That is the addiction to our thoughts. For some of us, our thoughts just manifest true bullshit to the point where we know we can no longer trust that voice. That is our situation. We can smell the stench of the untrue so clearly, as it manifests as destructive behaviour.
Most of us think 24/7 and act on those thoughts, but how often do we notice that we're obsessively thinking, and instead of just carrying on, stop and look at it? I'd hazard a guess as to say it's probably around 1% of the population. You are part of the 1% that is waking up, brother.
It's not the thoughts themselves that are the 'problem', if there is one, it's our identification with them. So I say again, you relapsed. So what? Are you merely defined by your thoughts, feelings, and actions? Are you defined by being a little person living a little life, or is there an awareness in you that sees all of this play of life taking place? This is the dream world, my friend. This is the matrix of your mind manifesting your deepest fears, sorrows, and pains. This is the transient one fighting for its survival. You know why? Because you're onto something. His days are numbered. You are waking up to the truth of your Being, and mind feels threatened by it. So it fights back. Stick to your path and one day he will come and join you on your meditation cushion. But till then, he will take whatever opportunity he has to sabotage you and throw you off the sense of his fickle transience. No one is every the same in every moment.
Every moment is fresh and pregnant with the opportunity for Enlightenment. Only the mind can resist that, and it must be watched.
Don't be discouraged. Whatever pain is here is only momentary, even if it feels like it will last forever. You are before all of this. You are the unchanging, ineffable wisdom. You are Brahman the absolute. You are consciousness itself. Everything is arising within you, as the infinite awareness. Nothing to push, nothing to pull. Nothing to become, nothing to strive for. Nothing to do.
Just Be. You are perfect in your essence.