
I've had TMJ for over 12 years, and one of the symptoms I've had is the clicking , cracking neck. It gets worse when my TMJ acts up, so I'm sure mine is TMJ related. It probably is due to the tight muscles that goes right along with the TMJ.
I also get more of the lightheadedness when my neck is cracking. Those muscles can cause lots of trouble..don't worry about a stroke, I think your to young for that.