I Grind My Teeth At Night When Im Stressed. I

I grind my teeth at night when im stressed. I also have allergies. Recently with autumn approaching i have been sneezing ALOT...however...something is new. Sometimes when i sneeze, my jaw will pop and then i get a highly uncomfortable burning, stinging, tingly sensation from the joint of my jaw up to about my right temple. I guess my questions are: is it normal? Should i worry? And what should i do other than make an appointment and get a mouth guard?