drekix,

Thanks for your question.

The scenario your have described sounds quite serious.  From your description, a heart problem, despite your young age, would be high on the list and most efforts would be directed to rule out this as a possibility. 

The most common tiny pill that is used under the tongue is nitroglycerine, which helps relieve chest pain caused by heart disease.  It can also help relieve discomfort in some esophageal disorders which can present with chest pain.  Other medications that can be placed under the tongue are usually for the treatment of extremely high blood pressure. 

Other possibilities for your symptoms would center around your lungs and airway.  Some allergic reactions can cause your airways (voicebox, windpipe, and large airway tubes in the lungs) to swell up and cut off the air which could cause your symptoms.

I can't answer you with any certainty as what actually happened.  I would assume that if this were your heart, you would have been admitted to the hospital, and the doctors would have discussed possibilities with you and your family. 

You need to discuss this with your doctor and get clarification of what happened.  Also discuss the need for any ongoing follow up.

Best wishes.

Martin Cane, M.D.