This has been a morning of temporary symptoms. Firstly, highly uncomfortable feeling in the gut AND very sharp localized pain in my right lower back. So, I was strongly thinking one of the kidney stones had finally been expelled from my right-hand kidney, and I'd have to get myself to Emergency at the nearby hospital. Then the localized pain in the lower back went away and while trying unsuccessfully to initiate a bowel movement I suddenly got a little nauseous. But nothing came up. Went to eat breakfast at usual time, but shortly after starting it, was abruptly very nauseous. Reached a sink in time and vomited. That got me thinking food poisoning from something I ate yesterday. Then the uncomfortable feeling in the gut just went away while I was trying again to initiate a bowel movement (again unsuccessfully.) So, all in all hoping this was all related to food poisoning, but just to be safe think I'll stay home today.