Oh my god. I went through the same thing a year ago. I was at my desktop when all of a sudden i had the same symptoms. It scared me so it got worse. i thought i was going to have a heart attack
But it was nothing. well...
What it was was either a panic attack
, your chest muscles squeezing to hard on your thoracic cage or high lvl of blood sugar.
The last thing you should do is think about it. Just tale a hot bath/shower and you'll be ok.
But, if it continues, go to the doctors. i know that would suck but it's better to know what it is than to die from something you dont know of.
Good luck and relax