The person at the front desk has no right to judge if a guy in front of her is sick or not
Yes they do when someone with your attitude turns up with the "big rich American migrant pole syndrome" demanding special treatment.
You were fit to fly back to the US the next day, clearly you were in no need of urgent medical attention, oh but your ego probably sure did.
It's obvious you have never really travelled outside the US, otherwise you would know that it takes time to setup a credit line to an unfamiliar insurer.
I can read you like a book, you didn't choose to live in Chicago just because you watched some gangster movies and liked the idea of being shot, no you moved there because you were cocooned and supported by the established Polish community that you despise so much.
As you witnessed your first attempts of international travelled failed when you hit the slightest hurdle lol