How can you tell if you're having an anxiety attack?

Anxiety: Feelings of impending doom with physical symptoms of increased metabolic functions such as rapid heart beat, sweat, tremors, short of breath, sense of urgency, gastrointestinal symptoms, tension headache, twitching, grinding your teeth, fear, etc.

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; a sense that you.