hey everyone, im 21, been biking 200-250km a week at high pace. never had any knee problems before. but for some reason about a week ago on a ride I felt some pain in my knee and I didnt think much of it and finished the ride. Now my left knee feels weak, stiff, gives me random pains and just doesnt feel the same. Does anyone know what I should do? Please help, not being able to ride daily is killing me