Stomach bug or food poisoning?

Last Thursday (~9 days ago) my BF and I ate at a counter service restaurant. It was the only meal we ate together in the past 48 hours or so.

The next night, he has severe diarrhea and vomiting. My stomach felt “off” and I was pretty constipated all weekend but he felt alright the next day.

By Sunday, I was no longer constipated but had developed severe diarrhea, a 100-degree fever, shakes, chills, and was generally feeling horrible.

I felt okay enough by Monday to function competently at work but spent most of the week feeling run down, constipated and irritable. I ate light and stayed hydrated and tried to get plenty of rest, but figured I was on the mend.

Yesterday, my throat started to feel very sore and today, a week later, I have diarrhea again and my temperature is creeping up.

I don’t have health insurance but will go to a clinic if it gets any worse but I’m getting concerned. Had anyone’s body done something similar? Why the sore throat and on again/off again gastrointestinal distress?