Replying to Knee pain

I've been experiencing knee pain for about a month or even longer in both of my knees. I repeatedly crashed and landed on my knees (mountain biking) awhile back. I had knee pads on and everything seemed fine but now my knees hurt if i go riding again, or if I drive for 2+ hours my knees (specifically my right) start to really fucking hurt. Some nights I can't sleep due to the pain i have. What do i do? My doctor is 4+ hours away when i'm in college. What do i do? Any exercises i can do or should i just not do anything for awhile?