So what was it?! What should you have done instead?

This one's pretty minor but it makes up for it in its stupidity and the other ones that pop into my mind hadn't great alternatives. I suspected I had food poisoning but, after a day of feeling too sick to eat anything, decided I must eat
something; so I ate the remaining chicken sandwiches that I had made the day before and went to bed. This was followed by the four days of spectacular hell, weakest I've ever felt.
18 months on, I still feel like my stomach hasn't fully recovered.
In retrospect, I would have to say that I probably should not have eaten those sandwiches, on either occasion.