Okay, I've been with my DH for about 7 years and we've been married for almost 4, so not that long I realize. But we've been through some hard times.
Something that has helped us when things were hard in our lives (career, money, living situation, etc.) and we felt rather desperate about it all and consequently were constantly discussing and worrying and fighting -- remember that not everything has to be solved at once. Not everything will be okay all the time, and that state of "less than 100% okayness" actually is okay.
I am assuming in saying the above that your marriage is fundamentally sound. And yes, things do have to be "okay" in that abuse of any kind is not acceptable; there does have to be a baseline of safety and stability and mutual respect.
But if you have that and yet things are just hard for you right now -- it was really helpful for me to realize that sometimes it's one day at a time. Really helpful for me to realize that we were in fact terribly, terribly fortunate to have what we had. Really helpful for me to look over and consciously remind myself that I was very glad to be going one day at a time with HIM, in our partnership.
In practical terms this meant that we tried to give each other little breaks. Someone didn't get the bills paid or the dishes done? Okay, not the end of the world. Those things can be done tomorrow. We tried to take walks together often, spend time on the couch reading/internetting/watching movies -- just give ourselves a little time where we weren't trying to fix things or be perfect as a couple, to just be two regular flawed people who were still glad to have a couch to sit down on together.
I hope things ease up for you soon 