[fjones11]

It really does take about two years to get back to your old self in terms of energy, focus, passion for work. Having a new baby is exhausting, and you don't realize just how much it takes out of you until later when you finally start getting enough sleep and aren't consumed by the everyday stresses of keeping another human alive.

That isn't to say there isn't something else going on (seeing a professional counselor/therapist is never a bad idea!), but seems entirely reasonable that this is a contributing factor. And the good news is, this part gets better!