Talk to Psychologist on Psychological Issue

I'm a mom of 3yrs old boy n he's very cranky n ziddi n aggressive. Im a working woman plus I'm studying so I'm kind of frustrated all the time. N my baby doesn't listen to me he keeps on demanding n whining n even starts hitting me. So i end up shouting at him n slapping him on his cheek or butt. I feel very guilty after that n it has become a routine now. I have no control over myself. I feel worthless n devastated most of the time. Plz tell how to deal with it? Do I need help?