Our expert says:
Could be an allergy? Could be the start of illness, maybe a chest infection? I guess by the time you read this, you'll know about that.
You certainly wouldn't lose fitness that quickly, especially if you are training a few times a week. And you're able to run for an hour, that would suggest that you are fit enough to get through a game without losing your breath.
So my thinking is that it's a once-off, random event that you need not worry too much about. The sinus problem also suggests an allergy - maybe the change of season, the dampness, who knows? You'll have to see what happens in future.
If it does happen again, and if that cough doesn't go away, then yes, I woudl suggest seeing a doctor. For all you know, you may have TB, and you need medication.
So see how it unfolds, and then seek medical advice if it doesn't go away. But I doubt very much that it's fitness related, but rather medical.
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