I am having severe cramping in my upper to mid stomach. It has occurred on two different occasion and usually lasts about 24 hours. The first episode was about ten days ago and the second one started last night. The first episode had chills and fever. This one has not. Both occurred after eating fruit...blueberries first and this episode was grapes. I have never had this occur before. I am 57 years old and female. The only relief I can get is by eating antacid tablets like rolaids but the relief is very temporary. The first episode I vomited right after eating the blueberries, but achieved no relief.