It appears you had acute idiopathic pancreatitis with pseudocyst formation. Usually these cysts gradually resolve. However, if they do not, further treatment may be required. I suggest you consult a gastroenterologist with experience in pancreatic disease. There are several good centres in India with such experience.
With regard to diet you can eat a normal diet and there is no need for any restrictions. Avoid alcohol and keep your lipid levels within the normal range.