 [ Symptoms ] can a foreigner living in singapore purchase any insurance plans from this platform [ Disease ] to start out try a food diary write down everything you eat in a day note down when you have your symptoms in time this can help you see patterns you could have a problem with a food allergy or you could be getting some kind of cross contamination when you cook if the food diary does not show patterns a doctor will be able to rule out other possibilities it might help to note down times you are stressed out sometimes that can cause problems too