Was Playing Basketball And Had A Player Run Into Me

Was playing basketball and had a player run into me and hyper extended knee inward. It is swollen like a grapefruit and can not put weight on it. have been taking anti-inflammatory medicine and icing. Doctor gave me crutches and knee brace. When should the swelling go down and the pain go away. xrays taken and doctor advised bad sprain the left interior cruciet ligament . Do not know with out MRI if tear accured.