Suggest Treatment For Pain In Right Knee

hi, i am 26 year old male. i am having pain in my right knee due to an injury which occurred 2 months back due to jumping from the swimming pool board. it recovered a littile bit but i still find it difficult to climb or get down the stairs. also, i am not able to run as fast as i used to. i can feel the pain on moving my knee joint as well. please tell me if it is a ligament tear, and if it is, then what should i do about it ?