Thanks for all the replies! The chest pains I have aren't as sudden, they're more gradual and constant over a period of time, so I'm sticking with my original suspicion that it's my HH (since the pains are always worse when I bend over, better when I stand up, etc...)
Diagnoses: GERD, small hiatal hernia, allergies (haven't been tested yet)
Medications: Nexium (GERD), Singulair (allergies), Tazorac (acne)
Note: I suspect my GERD was caused by taking antibiotics for acne. Please be careful about taking antibiotics when not necessary!