That sounds funny writing gas was her main complaints at work, so I need to explain. I don't want to scare you, but that night her pain got so bad she went to the hospital and they diagnosed her with diverticulitis that ruptured, and operated and saved her life! Apparently, it can cause sepsis, so I wouldn't take it lightly if that's what you have.
Diverticulitis is aggravated by small seeds or other hard particles getting caught in the diverticuli. So pain after eating things with small seeds is a good indicator of diverticulitis.
As for sepsis this would also lead to fever since it is an intense infection.