Thanks for the details High-
It is hard to know for sure obviously just by you answering a few question- and without the advantage of being able to examine you or do any tests ( like bloodwork, a chest X ray or an EKG).
Statistically, it would be uncommon for an otherwise healthy 27 year old to have cardiac chest pain. PLus the fact that you describe it lasting only " a split second'", also makes this sound less cardiac to me. Obviously, of all the possibilities to consider , a cardiac one could potentially be the most serious.
So what else could it be?
It could be musculoskeletal- but you don't describe chest wall pain- making it less likely.
It could be Gastrointestinal- mainly from heartburn/reflux- you don't have much in the way of symptoms to suggest this- but sometimes this can still occur and cause pain, without other obvious symptoms.
Finally, it could be pulmonary- Your cough, and mild shortness of breath as well as possible worsening with breathing suggest this as well. Possibly mild asthma, or "pleurisy"- inflammation of the lung lining. If it is the latter, it usually is from a virus and goes away on its own with time- antiinflammatories like naprosyn or ibuprofen may help.
If it is asthmatic- then you would need actual inhaled medicine to settle down inflammation and open your airways...
Again,. it would be impossible for me to be any more specific or definitive without seeing and examining you. As such, I obviously have a hard time recommending anything specifically as far as treatment.
I would certainly advise that if this worsens- or does not go away, you really should see a physician- possibly in an urgent care center. I can appreciate the cost issue, but your health is not worth a gamble...
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