Rant on man, that's part of the point of this thread. I've certainly done the same on here as well.
My daughter is 21 months now and still not the greatest sleeper, so I can relate to feeling like a zombie. You guys are one up on us however having two kids, so hats of to you both. I love my daughter more than anything, and there is nothing I wouldn't do for her, but I too have those moments of "is this really my life now?" Yes, personal time is essentially nil, I haven't gotten through a game since Dragon Age Inquisition (sometime this Summer, I think?), and in my case the relationship between the wife and I has been strained, but we've kept pushing forward. Despite the challenges, the stress and the frustration, I've been encouraged by the little victories - when little one went from waking up two to three times a night to one, seeing her play by herself instead of always needing to be crawling over one (or both) of us, and her improved ability to communicate her needs to us, resulting in less frustration.
Being away from family does make it tough. We're a couple hundred miles away from our nearest relatives, so we're pretty much on our own as well. Despite that we haven't used a babysitter for little one, but I think that might be something we might look into soon, just to get some time for the two of us, even if just for a couple hours or so. Might be something to think about for you guys as well - just to get that moment of reprieve.
For us (and me in particular), what's kept us going is just taking things a day at a time, and enjoy the moments you have, even if they are painfully brief sometimes. Communicate with your spouse about what you're feeling, and encourage her to do the same. That is a mistake I made, and am still working to get better.
Hang in there man!