Severe pain need help/advice

I have severe osteoarthritis in both knees. I am seeing a specialist on 24/10. I am in constant pain and it is spreading to the rest of my body. The pain is affecting my bipolar and I am very depressed. The doctor has put me on many different medications from paracetamol to morphine. Nothing helps and I also have the horrible side effects. I stopped the pain killers and use knee guards. But still pain to deal with but more mobile. Where to from here? I cannot go on like this much longer.