Okay so I was squatting at the gym a couple of weeks ago and failed a rep and went down, I didn't think anything of it , so got up and continued, after doing this I did a bleep test and my left knee began to hurt but I powered through, the next day it was agony and for the following days. After a week it began to recover and I started light runs again, however yesterday I did a very strenuous hike up Scaffell pike and coming back down my knee was killing, today I am finding it very difficult to bend and starighten but I can still walk on it. Any ideas what might be wrong with it and if I should. See the GP as I don't want anything to hold my application up , I am due to do my PJFT soon . In addition to this I've had to take the day off work and my manager says I need a sick not from the doctor so what do I. Say to the Dr ??