Originally Posted by Clanless
I would also think you'll want to get examined by a doctor. If you've got knee stability issues, it could mean on going ligament problems, like torn ACL/MCL. Those don't just heal, they typically require surgery, at least if you want full knee function.
THIS IS IMPORTANT.
I've torn my ACL twice and my left knee is far less stable than the right. I can still play, but I have to wear a brace, and need to rest and ice as soon as I'm home.
First order of business, get checked out by a sports Doctor. Tell him what's going on. Then tell him the type of physical activity that you do and what's involved with paintball. He'll most likely recommend an MRI for conclusive results, and then depending on those results, maybe surgery, or maybe lateral stabilizing brace - which is what I have to wear.
From there, adjust your play style. Play D-side. Play home. Play something that doesn't require you to be as on your feet or as active as another side of the field.
The short of it, take care of your body bud. Don't try and play through something that's gonna cause issues down the line.