How to determine if my having a panic attack?

Feels like dying!: Heart thumping, hard to breathe, dizzy, dry mouth, body pains, out of control. These happen suddenly with no apparent issue or event - that's why many think it is a heart attack. This is not all bad since it could be and at the er they can help with either.

Panic Symptoms: Panic attacks can develop rapidly ; include: marked anxiety; rapid, pounding heart beat; chest tightness or pain; shortness of breath with hyperventilation; hot or cold flashes; a sense of butterflies in the stomach, nausea or even vomiting; tingling of mouth or extremities; increased sweating; feeling faint or lightheaded; headache or shaking. There may be difficulty swallowing or tight throat;.