Crisis Support
If it is bad right now, reach someone. These lines exist for exactly this, they are free, nobody will judge you, and the person on the other end has heard it all before. New fatherhood breaks plenty of solid men. Calling is not weakness, it is maintenance.
If you or someone else is in immediate danger, call your local emergency services: 999 UK, 112 EU, 10111 South Africa, 000 Australia, 911 US and Canada, 111 New Zealand.
Somewhere else? Befrienders Worldwide keeps a directory of emotional support lines by country at befrienders.org. And whatever country you are in, your doctor is a legitimate place to start. Plenty of men leave that appointment wondering why they waited so long.