Twisted knee, throbing, cant walk

Patient: Ok I twisted my knee a week ago I have twisted it before and its never hurt this bad for this long. I cant bend my left knee very long without it hurting when I stretch it to get it to stop it takes 3 minutes to stop hurting also its getting to the point were I cant walk and the pain is so bad im to the point of crying

Symptoms: Throbbing pain in my left knee lasting for 3 minutes