(((hugs))) and lots of sympathy. I'm having a rough time of it at the moment as well. I won't tell you my coping method as it's far from healthy.
A hug from one of my little ones usually helps, at least temporarily. Or what about going through some photos? Set yourself some goals. Where do you want to be tomorrow, next week, in a year? What can you do to help get you there? Start doing something about it.
Other than that, early nights and trips out of the house can help break the mood a bit.
You must be shattered. Is there anyone that can take some of the load off you? I remember feeling exhausted just before DD2, so how you must be feeling with 2 children. Are you eating well enough and drinking enough water?
I can really sympathise so much. I was horrible when I was pg for the second time. I was happy about being pg and desperately wanted the baby but was so exhausted. And having 2 of them must be even more difficult.
I'm feeling much the same at the moment about wondering why I carry on. My kids are wonderful but it's so bloody hard.
Hang in there, keep posting. We are all here to listen to you, whatever you need. There is a light at the end of the tunnel. It may be distant at the moment, but keep it in sight.