Been there myself. Many people may not understand how extremely hard it is to break addictions. It is a vicious thing.
I’ve been clean for over 6 years with God’s sweet grace. The hardest part is that first few weeks.
Run, don’t walk, to the nearest Narcotics Anonymous meetings you can find. (If you can’t find NA, go with AA. Same basic steps.)
Go every single day if at all possible at first.
The first step is admitting you have a problem. You have had the courage to face that. Good for you.
If you stumble, if you fall, pick yourself back up and KEEP going to the meetings. Do NOT waste time beating yourself up. That does not help.
You can do this. I kicked the devil’s drug, which I won’t name here. So it can be done.
Now: most important. Pray, pray, pray. Go to Confession. Go to Mass. Spend time with Jesus in Adoration of the Blessed Sacrament if that is possible. Pray the Rosary, a most powerful weapon.
I will pray for you. Keep us posted.