Suggest Remedy For Stomach Pain, Vomiting And Diarrhea

Hello i felt faint and had some stomach pains, followed by 4 rounds of vomiting about 30-45 min apart, and then had loose stools in the next 6 hours (3 times), no fever just feeling weak all day. I have been hydrating well and ate some crackers, banana some oatmeal and rice this evening. It may be the antipasto I ate Friday night as no one else in the house got sick but me and this was the extra food item i consumed. I am an athletic healthy female with a recent detection of invasive ductal carcinoma in one breast of small blueberry size awaiting a lumpectomy with sentinel node biopsy in the next week. Any advice would be greatly appreciated. Thanks Dorota