Knee Pain, Numb Thighs, Gummy Feeling In Lower Back. Undergone Knee Replacement. Cure For Symptoms?

Am a 70 yr. old female, never been sick. Was having knee pain, Doc said was bone on bone..needed surgery. Jan. 21. 13 had total knee replacement & 12 weeks later had manipulation because of too much scar tissue. of my right knee am still having problems with knee. Doc says am ok. he'll see me in 1 yr. Had bladder infection, went to urologist had ct scan, everything ok there, but knee & feet still swollen am having problems walking & my knee feels scratchy like sand was in there.& thigh feel gummy or numb. Recently I started getting like a gummy feeling in my lower back and had numb or gummy sensation that was preventing me from having a bowel movement. Never had something like this. would appreciate any input.