Anger and anxiety symptoms and conditions

Mirena was put in on June 19th, and since day 3 or so I've been fighting depression, irrational anger and anxiety, no interest in sex whatsoever. I don't like myself. The cramping has let up considerably, but is still noticeable. I have a 2.5 y/o and a 2 month old. I normally have the patience of a saint, but with each passing day I find myself having less and less with my oldest. Little things that would usually not bother me, now make me want to punch through a wall and scream. This is NOT ME at all. I called my doctor yesterday and explained all this to him, and he offered to call in a script for happy pills, which I declined. He thinks it is a combination of PPD and the IUD, but I felt absolutely fine before I got the IUD. I got the earliest possible appt, July 6th, to have it removed.
On a positive note, I am exclusively breastfeeding my son. I was concerned about my milk supply being affected, but so far we're having no problems.