Try not to beat yourself up mate. Im lapsing from come roughly once a month.
This is what i do to keep me on track.
1st you cant drink any alcohol what so ever. No pubs or clubs.
Delete all your dealers nums and friends to do with coke. Come off social media.
Try some C A meetings. But i never have. I also listen to cocaine recovery stories on you tube and podcast. russell brand is good to listen to.
You need to take up some new hobbies to take your mind off the coke. Ive took up reading and it helps a great deal. Im in the gym alot more, and i have set myself some goals. Try and set your self some acheivable targets.