Can severe palpitations and high pulse for a few hours be caused by panic/anx attacks or could gas also cause this. eventually subside?

Panic attacks: Panic attacks involve a crescendo of anxiety that results in an outpouring of sympathetic stimulation (high Adrenalin state). The symptoms resemble angina although there is typically an overwhelming "sense of dread" that something bad is about to happen. The heart races, a tight throat and chest might appear along with shortness of breath with hyperventilation. Beta blockers and anxiolytics help.