Hamburger meal. Hamburger patty was dry (crispy) on the edges, I thought it was overcook, but it was the first time I had a hamburger there. I ate nothing else after that, started feeling sick about 40 minutes later. Ate Hamburger meal (my only meal) and 40 minutes later started feeling sick, very nauseous. Was vomiting all night, flu like symptoms, headaches, weakness. Three days later not fully recovered.