I think it's unlikely that you caught the illness from the fish. It's a possibility if you accidentally got some of the water in your food or something due to bacteria that is naturally in the water, but humans can't catch fish diseases.
Almost all deseases fish can have son't do too well in humans. That is, almost all illnesses you can cure by heating the weater to 37 C - buyt most fishes will not manage this either.
There are, however, a few exceptions. If I would develop a nasty infection, I would tell the doctor whether I had any illnesses in any of my tanks in the last 4 weeks.
But a headace, unquiet stomach? Never heard of that coming from fish. I'd rather believe you got this from worries for the fish
There are several zoonotic disease that people can catch from fish, here is a link to the Center for Disease Control.
Happy fish keeping!
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