My husband had the same problem and unfortunately for him the only way to stop the headaches and runny nose is to stop doing coke, he went to rehab for a month and after a few days the headaches stopped and his nose/sinus pain get better, I know when he’s back on it because it comes back. He 100% needs to go to CA or narcotics anonymous and commit to the meetings, it will help you to set some boundaries for going forward. Happy to chat if you need any advice, I ive just finished a support course for families of addicts and it’s been really useful and empowering