Swelling & pain in knees from 12 days.

Hello, I fell down the stairs on 24th feb which resulted in shin area wound, bruises, swollen knees& ankle. I visited orthopaedic surgeon and he said that you have minor wound & minuscule tissue injury around ankle which will heal over time with RICE.The knee & ankle swelling disappeared within a week but I observed pus drainage in my wound.After that I took augmentin for 12 days and my wound got covered with scab in the end of March but was surrounded with some swelling & redness. On 30th March, I started experiencing pain in my legs (knees) which became excruciating after few days & both of the knees started swelling. My doctor prescribed me 5 days dose only of Linid and signoflam as he was suspecting septic arthritis. After physical examination, I stopped medicine as per doctor . My knees are still painfully swollen( sply left) from 14 days now. All tests are normal (CRP, ESR, CBC, Vit D3, Diabetes, B12). Lymphocyte has increased 44.9 and last week it was 33.7. Kindly advise.