10 days post tkr and pain unbearable

I am a head and neck cancer group member as well.
Now I have had a tkr 10 days ago. I was not naive going into this new adventure and knew it would be very painful post surgery however, the level of pain I am living with is much greater than expected. I am no stranger to pain (surgery number13). Also, I have a very high pain tolerance. The swelling and bruising is as expected. The incision and staples look good. No indication of infection. The pain is in the knee joint. The dr originally put me on Hydromorphone. It wasn’t even softening the pain a bit. So he now has put me on Tramadol. No difference.
Have been icing and painfully completing all Physio exercises. Basically been doing everything I have been told to do. Movement in joint and leg is as expected etc. I am hardly sleeping and in constant pain. I realize that the first two weeks are supposed to be the worst and then it will slowly improve. I guess my question is what others have experienced in the first few weeks and/or if anyone has any suggestions. Or I am not too proud to hear that I am just being a big wimp and to suck it up. 64 year old male in otherwise good health and not overweight.