You have a disease but it's not an eye disease it's a potentially fatal drug addition. Get some professional help before your teeth rot and your nose caves in and you die.
I am not a doctor but please seek help and stop using. Life is to precious to waste it and, in my opinion, you need professional help before things spiral out of control - if they already haven't. You seem to be proficient with the internet, seek out drug abuse support local to you. The bloodshot eyes will be the very least of your problems if you keep up with this. (I speak from experience with dealing with a young relative who resorted to stealing from his own family to support his habit - he has since overdosed and passed - a total waste of a promising young life ).