knee pain

Hi..... I dislocated my knee the first time about 6 years ago then again 2 years later, its been about 5 years now and its been okay for the most part since then only once in a while it would swell. about 2/, 3 months ago i was lefting a 40pound weight, since then the pain has been getting worst such as blood rushing through the knee and lower leg it feels like but not much swelling on the outside. do you think some type of surgery is needed?. thanks