Hello, I Just Had A Core Decompression On My Left

Hello, I just had a core decompression on my left hip about 2 weeks ago. I have been on oxycodone 5 mg. I just went off around 4 days ago and have been using Tylenol. ever since I have been off of the oxy, I have been getting extreme joint pain in my left elbow pit, around an 8. Also in my left knee and finger joints. Why is this happening? What should I do to overcome this pain?