Could be your wife has similar feelings. If she doesn’t, she probably sees your struggle and wants to help you out, not feel part to blame.
When I had these feelings, “get away” didn’t help because I couldn’t turn off the brain. What did help was taking a short break from the big stuff and doing something – anything – than needed to be done. Just being able to cross something off my permanently growing list of stuff to do gave me a feeling of achievement, which helped my motivation.
DW and I also set aside some regular time together. Not a lot, but we found that going out to lunch or dinner alone every couple of weeks helped us get back to where we could have just small talk. Then, and now, life is much more relaxing when DW and I just sit around and talk about the little things.
Is lunch a break for you or do you eat while you work?