Suggest Remedy For Pain In Knee Due To Injury

I was waling the dog in knee deep snow and went to turn and snow created a cast and my knee felt a pop and I fell n the ground. I could hardly stand but took it slow and just waited for awhile to stablize. then I finished the walk slowly small steps. Came home saw no swelling and seemed like it was only painful if it was a rotational movement.Went to the gym but only worked stomach and arms. They have a physical therapy office at our gym and asked one of the girls if I should be worried . She said just ice 20 of 40 and repeat. Tonight it seems really stiff ice seems to make it worse and steps are killing me. I still do not see swelling.