I suddenly felt unwell today. For two days beforehand I had a stomach ache but today I suddenly started shivering and teeth chattering and got a headache. I was at work, I went straight to a doctor across the road. They saw me almost immediately though I didn't have an appointment since they were worried. They asked me if I had chest pain etc, but I didn't.
They checked for appendicitis, which I didn't think it was (it didn't hurt enough for that) but since the pain moved to the right side it was a possibility. It wasn't appendicitis.
I got a medical certificate the rest of the day and tomorrow. When I got home I brought up my lunch and later the water I was drinking to stay hydrated, and brought up the medicine for nausea and stomach pain. I had a temperature of 101.2 Fahrenheit/38.4 Celsius (underarm).
I feel much better now, sleeping through the afternoon. Eating/drinking is still risky but I don't have the stomach pain or headache or shivering at the moment.