Hi I Have Severe Cellulitis In My Arm Caused By

Hi I have severe cellulitis in my arm caused by staph infection from hospital been on IV anti biotics for 3 days and endone 2 hrly. Sent home today with oral anti biotics and panadine forte every 4 hrs . I also have 2 buldged discs in my Lower back. Dr put me on fentanyl patch 25 for this but I can't use them as they make me feel extremely sick. I found the endone helped alot with the arm and back pain would it be a good option to go to a GP and get a script for endone? Have spinal review in 2 weeks. Also i am bruising very easily everywhere.