Hi, I have a reoccurring problem. Sometimes certain noise (music) or motion (riding inside a car) makes me feel like I am having a heart attack. My heart speeds up and beats really fast. So far, this only happens when I am either in an environment with loud music or in a moving car listening to music. When it happens, I would need to turn everything off to get total silence...and sometimes need to pull the car over. This started way back around 1980s after I gave birth to my daughter.
It looks like you have anxiety and nothing else. Do some meditation or yoga. Try to keep yourself calm. You can also take some medicine to relieve anxiety. See the effect of all this and let me know.