Terrible anxiety about dry/delayed/secondary drowning.

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Thanks social media... It is such a rare occurance but everytime after we go swimming I have terrible anxiety. We went yestersay morning and my son swallowed water 3 or so times. He is 2.5 and learning to swim so it is going to happen. He coughed, never threw up, and continued to play. But today he is sick. Acting totally normal but has a swollen throat and slight fever. I am having terrible anxiety over it. Any words of wisdom?