My left knee and the crease in the back of knee and going down my leg and foot are swollen bad. Not the right side I'm having massive pain when I bend down or sit down or get up after sitting. I have chronic fibromyalgia but this pains different. It's almost like somebody wrapped a rubber and tight on my leg it feels like my leg is being so swollen it feels like it's cutting off circulation. Just worried about a blood clot