You might have TMJ.
I had a mild case of it....something in my joint where the jaw connects to my skull had gotten injured somehow....and it swelled a bit, pushing the jaw bone out of the joint.
I used to have pops like that and they had me yelling in pain each time they happened. Only, it would happen every time I chewed on something....even bread.
I went to see a doctor and he basically told me to "dont do anything that hurts", the way to kind of solve it is to make the swelling go down, that means avoiding anything that would cause your jaw to pop....like opening your mouth wide. For for a while I didn't eat anything which required me to open my mouth wide...no burgers or sandwiches or anything, just soft food that could be easily eaten, like soup.
After a few weeks, the popping became less painful, jaw moved back into place. Just one problem: TMJ is permanent, which means although it gets better, it never really goes away.
So I dont have pain or problems anymore, but if I start talking, I hear little tiny clicks and pops in my jaw and head....and as a result of that I talk less than I used to because, simply, it annoys the hell out of me. But no one else can hear it.
My advice: Go to a doctor and have your jaw checked. I'm serious. If you might have popped your jaw out of place, things will get worse before they get better. Go get checked right now, the x-ray is worth the money believe me. Then take your doctor's advice.
That's my recommendation. You should always see a doctor. I hope you will.