DS, 6 had his normal swimming lesson yesterday and swallowed some water (not sure of amount but enough to make him cough and he then wanted to get out) and since then he's had 4/5 long bouts of coughing, he's coughing every 10 seconds or so when he's having a bout of coughing, sometimes it sounds dry but most of them sound like a wet cough. He has slept but was very unsettled.
Is it possible the swallowing of water has irritated his throat and that's what's causing him to cough?