First of all, alcohol interferes with sleep cycles, even in small quantities. It can make you sleepy initially, but will make you awake and alert in the wee morning hours between midnight and 4.
I didn't see any mention of BF, but that plays a huge role in how you should proceed. Iets assume you are not (because you are drinking to the point of drunkenness which you surely know is not safe or wise while bf).
My sister had a psychotic reaction to a medication once (steroids). I tell you this because it gave her insomnia which exacerbated the psychosis. She ended up in a 48 hour hold in a psych ward and we feared she would not come out of it.(which was actually a realistic fear, and it could have taken 6 months or so for her to fully recover from the psychosis. ) She needed sleeping aids to counteract the insomnia. The insomnia became the bigger enemy than the initial psychosis, sending her into a more severe psychosis. Sleeping meds were how they finally countered the drug reaction. And yes they work. YOU NEED TO GET SLEEP EVEN IF THAT MEANS TAKING DRUGS. ( But alcohol is not the right drug, I think you already realize this).
Problems like the one your are having can go from bad to worse very quickly. Please please please call on some family, take the sleeping aid, give baby and kids over to some family, and get some serious sleep. Even if the depression persists, you need to get on top of the sleep depravation for a few days. You need to get over this hump and soon. Even if hubby has to take few days off work.
Prayers for you K.C.
(and just remember, they are only feelings, don't take your feeling to heart when you are down and out. Things will get better)