Do NOT start IV'ing.... If you are starting to feel yourself losing self control, now is the time to go consult a doctor about easing off of usage and avoiding withdrawal symptoms as much as you can. If you are losing self control sniffing, you will for sure become a slave to the drug once you start IVing. Don't worry about telling your doctor either, they deal with this stuff all the time and you have no reason to be embarrassed. Also, doctor patient confidentiality legally requires them to keep this only between yourself and him... so you have no fear of people finding out. Best of luck, brother.