I need help

What do I do if I need to seek counseling? I have been experiencing high volumes of stress with my son throwing temper tantrums all day long, and it’s starting to take a toll on my mental health, especially being 20 weeks pregnant. I don’t know what to do or where to go or who to talk to. Do I call my OB and ask for a recommendation? I feel so defeated and lost, but I know I need help.