Woke up from a nightmare and my heart was pounding so much it hurt. took 5to10 min to stop. hist pots gerd and anxiety. should i worry?

At your age: I don't think you should be too worried at least about the heart pounding. That is pretty normal after a realistic seeming nightmare. Nightmares cause a significant adrenaline release which increases the rate and force of contraction of the heart...a normal response.

Night terrors: There are Nightmares and Night Terrors. Usually, Nightmares are more toward the end of one's sleep, like at 3-4 AM and are part of REM or dreaming sleep. Commonly, one remembers they woke up with a bad dream. Night Terrors ususally occur more toward the beginning of sleep, like before midnight, and often, one doesn't remember dreaming. Both are common in kids. Both are harmless.