You definitely should see a Doctor, especially with the other symptoms that you're experiencing. As long as you've stopped cracking your neck, I imagine your condition is completely treatable/manageable. I do realize it's difficult to break a habit like that - my daughter cracks her neck and I'm always bugging her to stop. (Especially, with the neck issues I've faced).
Since you're experience symptoms as a result, I would definitely seek medical advice and maybe have some test run.
Good luck with that.