Whenever I was sick in India, I used to get the neem leaves and then make neem leaf juice, using a blender and water... extremely bitter!! But it cures all ailments of the stomach. Neem as you know is a natural antibiotic. I sometimes make a neem leaf tea by boiling a few leaves in water and then drinking the water. Other good home made Indian herb teas can be made by boiling equal parts of cumin (i.e. jeera), coriander seeds (i.e. dhania seeds), and Fennel seeds (i.e. saunf). Take a 1/3 tea spoon of each and let steep in boiling water for 5 minutes and drink this after every meal. You can find more recipes in any good Ayurvedic books - I have one by Dr Vasant Lad - its a book on Ayurvedic home remedies. Also, consume turmeric in your diet.