Hi..Can understand your concern...As per your query about chronic diarrhoea for about a month can be due to many reasons like infections,inflammatory bowel disease (IBS)celiac disease etc .I advice you to take antibiotics by having stool culture and senstivity test and keep yourself hydrated as water loss is much by using ORS and glucose and water in other forms .Avoid dairy products except yoghurt .Avoid spices and fatty and junk foods.Take easy digesting foods like khichdi moong daal,curd rice at small intervals in little quantities.You can use probiotic like prowell or duralac.At last if no relief is seen you should go for investigation like colonoscopy to rule out the exact cause.I hope the information helps you.Take care.