Faith in baba is strongest medicine. Don't know about your problem but if possible and can do without doubt :
1. Reduce Rice in meals, but increase fruits. (For a few months) (Type of fruits, consult your doctor, if any specific disease).
2. Reduce or Stop sweets. (Even chocolates) for some times.
3. If you are non-vegetarian, Take only Veg for next two months.
4. If you use ghee in more quantity, reduce and use cooking oil.
5. Last while sleeping at night, Put a glass of water before photo of Sai, In morning drink it after meditating on sai and chanting om sai ram for 1-3 minutes.
Read (or listen) Sai Satcharitra!
Have Faith! Have Patience!
Sai will do all well!
om sri sai ram!