Some type of Stomach Sickness

I came home from church and took my nap as I normally do. I felt an uneasiness in the pit of my stomach. I lost all appetite and developed a fever in the evening. I took some aspirin and ate some dry crackers and sipped some low sugar apple juice. I had gotten the chills so I was bundled up in bed. About 9:00pm, I vomited up a little bit of clear liquid as I woke up. The fever broke and I feel much better now. Could anybody reading my blog tell me what caused this and what it could be. I am baffled. I think I had some spicy meatballs during mingle Sunday at church that did not sit right with me so I came home and laid down. The fever and the vomit are a mystery. I do feel fine at the moment and ready to take on the challenges of the day. Praise God.