Narcotic withdrawls?

i have been on vicodin for about the last 8 months within the last 3 months i have been taking enough to run me out of my months supply within a week. so i started bying other peoples scripts like percocets and methadone i realize i am going way over the top with this stuff and have decided to quit can anyone tell me what to expect and how long withdrawls from narcotics last is it possible to ride it out i have been off them for about 4 days now and i just seem to keep getting sicker. any advice would be appreciated i dont want to go to a doctor for it. do i have a choice?