Exercise is good but it increases my hunger too much

Hello all: I have regular hypothyroidism too and I exercise like 3-4 times a week but i have a little problem with exercising and it is that it makes me too tired and it increases my hunger what can I do? how should I train?

This is my routine:

I walk 25 minutes (3 to 5 times a weeek) in the afternoons

PS: I walk to kill Depression too i suffer from depressive mood and boredom, apathy and abulia


Thanks

Juan Carlos