So its been going on 2 1/2 weeks since i sprained ligament in the knee still hurts but now it hurts when i walk?

Needs evaluation...: If someone has not seen you yet you need to get examined in order to get a final diagnosis. In the meantime, if you have not done so, rest, elevate your leg at least 20-30minutes daily and alternate hot and cold packs. If not allergic take ibuprofen or the like three times a day. You need to follow up with your doctor on this.