Dont beat yourself up about it for a start. Admitting you have a problem is a big start in recovery.
You need to delete every dealer out your phone or friends who take cocaine. Even family. Dont even hang around with coke users any more. You cant drink alcohol as this is a trigger for coke.
Avoid all trigger points, places you picked up.. pubs you have used in. Walk another way. Things that trigger u have coke with.
Your just stuck in a big hole and need to change your routine around. So do a weekly calander with daily task of new hobbies.. gym, read, walk, run, swim, decorate, build something.. anything u want. And stick to it! Tick each day off u do it as a goal you have achieved.
When u wake up, tell yourself you are just going to stay soba for today. Planing far ahead is too much.