I abused oxys for some time. I couldn't taper, so I just went cold turkey. Not fun. The reason I couldn't taper was because I just couldn't control myself. So I just bit the bullet. I probably should have seen a doc, but I didn't. Everyone is different, but the worst part was the first 7 to 10 days. No sleep, depression, anxiety, nausea, headaches, bodyaches, diarrhea, so on and so on.
Don't be afraid to get help with a recovery program.
God bless.