I had a knee arthroscopy 9 months ago for two meniscus tears in my left knee?

Hi. I have a history of knee injury. I was a competitive cheerleader for almost a decade. A couple years ago, I shifted my knee cap. I went to a specialist and was given a brace to wear for a month. After that, it was fine and I didn’t go through physical therapy. Then, I had a knee arthroscopy 9 months ago for two meniscus tears in my left knee. One was tiny and the other was like a bucket handle tear. I changed specialist from my original one a few years back. My current one doesn’t think my original injury was treated properly. Anyway, I went through some physical therapy, but my doctor said I did not need to continue since I had my full range of motion back. There was also no signs of cartilage damage or arthritis in my knee. The past few days, the outside of my knee (near one incision scar) and the side of it has some pain and tightness. The knee is a bit swollen and feels like it’s heartbeat. I think I overworked it, but it too sure. I’ve been icing it, elevating it, and started using my knee stabilizing brace again today. I’m hoping it’ll pass with some rest and some pain relievers. Also, I’m just hoping it’s the frequent changes in weather somehow affecting me. Any thoughts would be appreciated.