From your symptoms it seems that your infection has not been controlled. What medications had you taken? Did you get any work up done? Antibiotics are prescribed if test results show the source of your food poisoning was bacterial, and in cases where symptoms are severe or last longer than 3–4 days. Take a light diet and lot of water and fluids.You may take natural probiotics like yoghurt. For exact diagnosis and treatment visit your doctor and discuss your concerns.
Best luck and take care!