Going nuts

So im 25 weeks pregnant and im going flippin crazy to the point where im scaring myself. Like i get so freakin mad over little stuff im homicidal and so sad and overwhelmed for no reason that I'm suicidal. My babys father doesn't understand and its super insensitive about it telling me to 'calm down' 'stop whining' or stop which makes it worse. I've talked to a doc who got me on a antidepressant but im still so crazy im pretty terrified of my emotions. Anyone else going through this and have any ideas to make it better?