Cocaine aniety

Hello everyone I am pretty anxious about my health right now, I did something stupid the last few months, doing some coke. Now I am scared I'm going to die from a heart attack or something. I don't know the damage it might have already done to me , I did it because a friend kept offering it when we went out. But I'm cutting all ties with him now. How do I tell my girlfriend? She is the love of my life but we have been having some problems lately , and I think she might break up with me. Thanks B.