Answer:
I'm unaware of your age and weight and believe me, I am not a professional but it could be any of the following:
Explanation:
Heart attack (possibly) but if it re-occurs multiple times then unlikely, Pneumonia (also comes with coughing usually but not always), and an anxiety disorder (which is more than likely it but you should definitely mention it to somebody and also most definitely go to the doctor).
Waste products are constantly being produced by the body and must therefore be excreted. If they are not, they will increase in concentration and may interfere with chemical reactions or damage cells. Waste products that must be removed include carbon dioxide and urea.