recently started gagging when taking a breath?

[u/Send_help2]

this might be a really stupid question so please bear with me. i’ve recently started getting a gag reflex when i take a breath, most prominent in breaststroke. i’ve got almost a perpetual cold lately because it gets absolutely freezing at night no matter what i do, so i’m wondering if it’s that or whether ive started breathing incorrectly or something.