How dangerous is it to quit oxycodone 30 mg when you are shooting 15-18 per day?

I just detoxed from oxycodone, shooting 15-18 per day intraveneously. I tried to do it myself, but ended up in hospital. then detox center. Could I have died from this had I not sought medical help?

: http://alcoholdrugstreatment.info/how-dangerous-is-it-to-quit-oxycodone-30-mg-when-you-are-shooting-15-18-per-day