A few weeks ago I tripped & fell down the stairs in my house,on falling most of my weight went onto my knee, there was little or no pain, just slight discomfort. However shortly afterwards my knee became swollen and soft with fluid. After a few days the swelling etc; almost dissapeared ,now after doing some DIY (laying laminate flooring ,climbing up & down ladders painting the house,some swelling/fluid has returned although not as bad as after my fall. Do you think I should see my doctor or will time & rest solve the problem? I am 66years old.