Haven't had once since February, at work. Mine involved heart palpitations. And I am left exhausted, shortness of breath, yes. I know it's stress related, for myself. I've endured them since I was a teen. Had a good one, back in '07 or early '08. Couldn't calm myself down, landed rushed by ambulance to the hospital. Thought I was having a side effect to a new to me, MS med, that mentioned chest pain and fast heart rate as a serious side effect. Was given some Xanax and sent home, after the test were done, showing heart palpitations. I remember heart tests as a teenager.
If it's stressing the body, then it stands to reason that it will exhaust the heck out of a person. Taxing on the body, is how I see panic attacks/anxiety reactions.