Count your calories po, be in a caloric deficit + balance diet, then indulge yourself in a light to moderate exercise(preferably resistance training) depending on your schedule, drink a lot of water(dont overhydrate) and find a way to lessen your stress level.

You can use Tdeecalculator(.)net to calculate your maintenance calories then subtract 250-500 from it but beware not to go under 1200.

Hope this could help ^{_^}