Don’t worry, you are not alone, everyone has a lot of pain the first few days, & sometimes longer. It will get better, but you need to be VERY patient, do all your PT & exercises, & don’t give up. I found an ice machine was very helpful, also elevating the knee, & moving as often as possible. I had two TKRs & only took Tylenol, despite the pain. However, everyone is different, so take what meds you need, & make yourself do your PT, even though it hurts. The pain will dissipate over time, but give yourself 6 months to a year to feel “good” about having that TKR..