Depressed

I've been trying to study, but my 5 week old is the boss... my mom watches him for 2-3 hrs during the day and usually throughout the night when we visit her. Hubby os sometimes helpful (he's in school too), but I feel like everything is on me. I love my baby boy, but have been so overwhelmingly tired and emotional... I can't believe I cry so many times a day! I need some support and suggestions before I melt down!!