Sounds like a second opinion is needed. I had SCAD (rare type of heart attack brought on by distress) recently and I’m healthy with no underlying causes. But all the symptoms you talk about sounds like a build up that could one day cause a heart attack like SCAD (spontaneous, coronary artery dissection). I would have your troponin levels checked (blood draw) when you have an event just to be on the safe side. Also ask about cardiac rehab classes. They can watch you while you do strenuous activity and monitor you at rest as well and help you to cope with the emotional distress it sounds like you’re having when an event happens. I’m not a Dr but I am in the medical field and it seems like you need to find another cardiologist because what you say doesn’t sound normal to me. Of course try the anxiety meds and see if they work to get your stress under control and maybe get tested for reflux. Silent reflux is a real thing and presents differently than just heartburn symptoms. Just some ideas. Of course if you take my advice and it works great but if it doesn’t then I’m not responsible because your are a grown adult and make your own decisions and you chose to get a second opinion, k. I just want to help and I wish you the best on your journey. Hang in there hope is not lost , keep going until you find the answers you need.