Possible postpartum depression? I had that with my last pregnancy. It was pretty bad, but I was not being treated either.

I think I you are questioning if that is delusional thinking, than it probably is. I do that too, especially when I am feeling low.

Lithium doesn't work too good until you are at the therapeutic level, so you might nit be there yet. Hopefully when you get to 900 mg you will start to notice a big difference. Make sure you let your pdoc know how your feeling. Just try to hang in there.

And welcome to PC, hopefully you will find it helpful here.