In hypo, body's metabolism slows down, so body burns less calories than normal.
To overcome this eat small frequent meals, tk complex carbs like whole wheat atta, whole pulses n legumes, lots of vegetables n fruits, good quality product chicken, fish, eggs, paneer etc.
Do regular exercise as u already been doing.
Next Steps
in addition to stretching n abdominal exercises, do some weight training also, as gaining muscles increases BMR AS well.
take ur medicine regularly.
Health Tips
u can avoid goitrogenous foods like veg belonging to brassica family cabbage, cauliflower, broccoli etc. turnips,raddish greens, soyabeans, sprouts etc.