I have been having pain in my knee for months and months which has been gradually getting worse. I have tried resting it and not training but this doesn't help. I tried strengthening my glutes etc but that doesn't help either. I've tried doing low impact sports but it is still the same. I resort to wearing a knee strap and taking pain killers. The pain is affecting me during the day while walking around, especially stairs. This is really painful. It has started to swell lately also which comes and goes but today is really painful and feels like there is fluid in it which is restricting my movement. Help!