Had Major Back Surgery 22 Days Ago. $ Days Ago

Had major back surgery 22 days ago. $ days ago I complained to doctor about taking to many Oxycodone 5 mg. 2 every 3 hours. 1 less then prescribed. I felt like that is just to many pills a day. And having to get up at night. He added Morphihine Sulfate er 15 mg. 4 days ago. Said after a couple days I should be able to redoes Oxy amount. Morphihine is a slow longer release. And I should not need as many if any Oxy. I'm still taking the same amount of Oxy, because I have had no extra pain relief. Now I feel like I'm taking 2 times what I need with no difference in pain relief. Any suggestions?