PLEASE HELP

Lucia
Hi guy's I had my baby boy almost 11 weeks ago by c section and yasturday I started my period but sense las last night I been having what I can only describe as the strongest contractions I have ever felt and the only thing that helps is taking pain killers really really strong pain killers to be exact oxycodone which was prescribed to me by my doctor for pain relief after the c section but as soon as they star to wear off the pain comes back I called my doctor but she's out of the office for the next 2 weeks and I don't know if I should go to the emergency room if any of you have experience this please tell me what you did or if any of you have any suggestions please anything would help I don't want to continue taking this pills because they are so strong but I also can't handle the pain any more please help