The oxy is probably tearing up your stomach as it is...
Have you already stopped?
Have some pepto bismal and an OTC stomach acid reducer on hand. You have to drink as much as you can! Vitamins can upset your stomach so if you go with Gatorade you'll be fine...also Vitamin Water is great.
Let us know what your plan is...
i certainly wouldnt go to sub, what mg have you been taking , it does sound as if you need a drs. help with a detox, tell us more about what you are doing, have you just stopped ? or are you tapering? there are things to help you ,keep posting, i wish you well, god bless,
Check out the "Thomas recipe." But it sounds to me like you should either go the Suboxon route or go straight to the doctors.
Good luck sir.