Feels like my throat's closing. What do?

Hey ents,

Got a question for experienced tokers here. I don't smoke but perhaps once or twice a year. For the most part, they've been chill experiences, however, I've had to learn to deal with an unpleasant sensation I get sometimes while high. It feels almost like my throat is closing, and I tend to breathe manually when this happens. I become extremely aware of my breathing and swallowing and it just feels extremely wrong.

My question is, is it possible to overcome this? Could it be an allergic reaction to trees? Can I learn to stop worrying and love the feels? Srsly, what do?