Did i tear anything in my knee after a fall?

Based on what you described I think you should go to a doctor! What if someone using an avatar says take an aspirin, get a good night's sleep and it will be better in the morning.Would you accept that? You need to go to a medical professional and not accept a diagnosis from anyone on YA. I am amazed at the number of people who use YA seeking medical advice for serious conditions when they should be going to those trained in medicine.