Why did I get multiple panic attacks recently?

Asking you about medical conditions, unless safety is a direct factor is playing dirty pool, see HIPPA. I would have answered that question with another, "That is an interesting subject. While we are on it, do you have any medical conditions?" Panic disorder and having your fight or flight response take off like a wild deer on you is a tricky thing. I had this when I came back from the Army to such degree, I spent two weeks in a facility and they announced happily I had a nervous breakdown..Here are my tips from experience and having gone through medical school.
1. Many people do not like medications, and it is very often that the medication is not tripping you up; it is all a matter of finding the correct one or combination thereof that works for you. I always found that when I practiced, or in my personal life, the best combination to dial up here is an SSRI antidepressant you can tolerate given with a low dose benzodiazepine, to be used PRN.
2. Avoid caffeine; I used to tell patients with this problem that caffeine is a fiend.
3. Get plenty of sleep—an adequate amount. When you wake up, you want to feel well-rested.
4. Pracice good nutrition, everyone sort of has a different ideal about this.
5. The last one, perhaps the heaviest hitter, is physical activity. Try to exercise according to your age and health—just don't overdo it. When you do have an attack, take a walk or get on a treadmill to burn the adrenaline off more quickly.
I'm so sorry you're having these. I still do them once in a blue moon, but I have some weight on my shoulders currently. I hope you find some of these helpful and can return to a state of not having them. It sounds like your brain chemistry has fallen out of whack for some reason. If you did not have them for years and they are suddenly back, this would be a good indicator of that. Please feel better soon.