I male 29 living here in the Philippines and you know what, I have been waiting and expecting here in this forum to come across with someone with a really similar to what i had experience last year which definitely same month as you experienced your first symptoms. O well just I have been living in a negative atmosphere for a year now. This all begun after my friend and previous co-worker died because of heart attack. It was the trigger point of my anxiety. I kept thinking that it might happen to me as well. Everyday I always had panic attack until it cost me a vowel syndrome that ends up to gastroenteritis. Because of this I was rushed to the er and found out that my potassium came down because of gastro. I stayed in the hospital for 3 days and was thinking and can't believe that it was gastro until i decided to go to a cardiologist and had me checked and done some tests that came back normal. But that doesn't ease my mind until now I'm still experiencing heavy anxiety and panic attack. All the symptoms you wrote are the same as mine. Honestly as of now I feel a stubbing pain in my left chest. But you know what I somehow this helped me. Coz I realized that I need to live my life in full with my family and friends. They are making me strong especially my daughter and wife.
God is good!
My trigger point was exectly the same, a 30 Year old boy lived nearby my house died of heart attack, i was thinking insanly about him and after two days on a vacation I had my first panic attack and you won't believe that no heart related test is left to be considered like Ekg, echocardiography, TMT, Blood test and finally CT angiography and all came back negative... big LOL.
I have spent lots of money since then and but now I came to understand that this is not my heart but gastritis and alcohol.
But honestly I am still thinking about my heart, it doesn't matter if the pain or tingling happens in fingers or anywhere I relate every pain to my heart, I feel my heart beat while lying down or while sitting. shooting, nasty chest pains are the worst one. I also have pre-drinking anxiety.
I have two beautiful kids and caring wife, well I hope someday I will be happy again as I was before.