Hi welcome to health care magic.... Here you have not mentioned duration of your complaint... You have nausea and rashes over body... So yes it doesn t seem to be bacterial cause... It is most likely viral causes like that of viral flu.... Symptomatic management done.... You can take antihistaminic drug.... Over rash calamine lotion can be applied.... For nausea domperidone tablet can taken.. Try to avoid heavy fatty meal as they delay gastric emptying.... Kiwi is good fruit for digestive dysfunction. Also it contain vitamin C and E , pottasium , linolenic acid , magnesium etc.so good to take daily.... Excess non veg and bad habit like smoking and alcohol avoided... If still problem USG done and consult physician for proper examination... Take care. Dr.Parth