Damn your in for a rough ride. What dose did you run out at? Expect somewhere between 15-20 days off nasty acute withdraw. Followed by a long period of post acute withdrawal symptoms. Of you are serious about staying off opiates you should go to a doctor or psychiatrist and explain your situation so they can write you some comfort meds. I couldn't imagine facing this kick totally cold turkey. I was at rehab when I faced withdrawal from 2mg a day and it was still truly hellish. You should ask for clonidine, gabapentin,lyrica, zofran, a muscle relaxant, and some kind of benzo. Get some loperamide at the pharmacy. It is an opiate that doesn't cross the blood brain barrier so it will significantly lessen withdrawal in doses over 10mg. Also getting some weed is a good idea too.
I wish you luck man. If you do find yourself relapsing look into getting on methadone. I know it has a bad reputation but it has saved my life. Btw did you post something similar on reddit?