Can you manage 5-6 smaller meals instead of 3 huge meals? Dry fruits, fruits, sprouts, milk and cookies, unsalted popcorn, buttermilk etc whatever is that you can buy in your canteen or stores can be options in between your main meals. Consult a dietitian for a detailed diet plan with balanced calories, protein and fats. Felling happy about what you eat is very important without feeling any guilt. Take time out for a little exercise to boost your mood and feel good.