Was just messing about with DP and he was chasing me into the bedroom, I knocked my self on the end of the bed and my knee did kind of a weird twist which was so painful! It felt like something teared!! And made a loud crack! Been writing in agony for a few mins probs from the shock. It's now very sore and painful. Nothing looks to be out of place. I can bend it and straighten it and put weight on it but it's very painful and feels like it might give way. I can already feel it starting to swell. What the bloody hell have I done? Dp says it doesn't warrant A and E as it's obvs not broken. What shall I do and what could it be.