Originally Posted by
DocDan84
First, I agree with what's already been said as far as focusing on hugging your knee to have your hip take the majority of the stress.
Second, I realize you're asking for help here, but if you can get to a doctor, especially one who specializes in musculoskeletal issues, it would serve you well to get the damage objectively examined to ensure there's nothing more serious going on.
Alright, with that said, icing your knee in the painful area for 10-20 minutes at a time maximum, then waiting a 1/2 hour and repeating as desired is one way to control discomfort. After icing just gently work your knee through its full comfortable range of motion. Do some light stretching around your thighs and legs. If you have a foam roll, you can lie on your back and put it under your knee, then do some end range leg/knee extensions for strengthening. You can also do step-ups on stairs for strengthening purposes. If all that's comfortable, if you're not already doing so I recommend supplementing your jiu jitsu training with strengthening free weight exercises like squats, deadlifts, and lunges to help strengthen your muscles and connective tissues. Always warm up thoroughly before practice, and you might take some time to do some light stretching after practice to cool down, especially if you're feeling tight.
Good luck, I've "popped" my own LCL on my right leg before (my "weak" rubber guard side") trying to do The Pump. It takes time and patience, but you'll most likely be fine.