If you're able to read this, your body has enough oxygen right now to function. So you're fundamentally OK. Whatever you think you need, you probably don't. So don't feel bad or use because you can't have something. Breathe if you can. If you can't, move somewhere that you can. God will let you know when it's over so just keep going in the right direction until life stops. Be at peace so long as you try to use the 4 absolutes (purity, love, unselfishness and honesty) to guide you in doing the next right thing.
Ask your Higher Power to take away sadness and fear. Repeat to yourself once an hour today: “I’m OK” as you take a slow inhale and even slower exhale. Don't pick up the drug, pick up the phone.