That crap coming out of your nose is probably caused by whatever the coke is cut with. Cocaine is water soluble, but most of the sh*t they use to cut it with is not. It builds up inside your sinuses and causes all the lacerations inside your nose. Not good.
I used cocaine for about ten years although I've been off of it now (except for a dozen or so episodes) for the past twelve years. My nose was so damaged that I resorted to smoking it for a long time until the cocaine psycosis kicked in and I started seeing shadows and hearing voices all the time.
How long and how much have you been using?