3rd knee replacement in a year and a half on same knee

I had a total knee replacement in May 2023, with pain and swelling and was unstable. Surgeon said I had to have a revised knee surgery 6 months after the first in. He told me that he didn't put the cement in the bone for the implant to be stable. After the second replacement I continue to have pain and swelling he told me that all x-rays looked good. I have been to 6 different rehabs for therapy with no results. 4 weeks ago He said that I needed to have the spacer replaced because he put the smallest one in and it needed to be higher. I am still having pain and swelling. Now I don't know what to do. I am a 65 year old female that was active be for the first knee surgery, now it hurts to stand from a setting position and feels like a tight band around my knee. If you have any information that will help I will greatly appreciate it.