Hi mylee. i know exactly how you feel. I abused oxys awhile back. Withdrawals are very rough with this stuff. If it gets really bad, go to the ER. You could go into seziures. Not trying to scare you too bad, just giving you a heads up. The first week to 10 days are the hardest.
You CAN do this. It may not seem like it now, but you can do it. Go to a lot of AA or NA meetings if possible. Read and post on this site. Let people here and at meetings know how you are feeling. People here and at meetings will reach out to you if you let them. Don't be scared to reach out. Many, many of us have been where you are at.
Stay strong, God bless.