Stop doing cocaine. It is a horrible drug for your body and can cause heart damage. Is it reversible? I don't know, I"m not a doctor. But I do know that pain is the body's way of telling you something. Get off it NOW and if you need help, for God's sake, be smart, and ask for it. Go to any NA or AA meeting. I think some cities even have CA meetings (Cocaine Anonymous.)
I was a regular weekend user for many years. The recovery got harder between uses over the years. Depression, extreme exhaustion, serious nosebleeds, lack of interest in anything. Despite all that, I'd be at it again Friday night through Sunday, no sleep in between. My face aged dramatically. During my final session my nose started bleeding profusely. Upon blowing my nose a large piece of cartilage came out. I haven't been able to breathe properly through my nose since. I went down to 87 lbs. I haven't touched it since. I've been clean for 15 months now. I do still crave occasionally but remind myself why I stopped and that in itself prevents me for doing it again. I am now a healthier 105 lbs. I hope it never gets this far for you and wish you all the best!