New med given, 2 hours later couldnt breath. anaphylaxis? can undiagnosed anaphylaxis kill someone 36 hours after initial attack.

Anaphylaxis: If you took a new medication and couldn't breathe well 2 hours later, you should return and report that to your doctor immediately. It certainly could be part of an anaphylactic response, some of which are fatal. Also, there is what is called a 'slow-releasing factor' of anaphylaxis, so anaphylaxis can indeed occur up to 48 hours or longer after exposure. The full syndrome includes low BP (shock).

Anaphylaxis: Clearly, you have had a serious reaction to the medication. Serious allergic reaction results in bronchoconstriction and chest tightness, swelling the sensation of "closing" of the throat, as well as potential drop in pressure constitutes anaphylaxis. You should discuss this with your doctor now as depending on the drug etc. Allergic effects may persist.

Doubt it: If you are fine now you should be ok. You might request a blood test to see if it was the med that caused the trouble breathing but i certainly would not swallow it again!