Your wife is probably as unhappy as you are, maybe more so if she feels like she has even less control over the situation than you do. The "nagging" is likely her way of expressing frustration and telling you she needs help. Try to avoid thinking how much easier things would be without her. Things are likely to be easier with her if you work together.

See if you can start a virtuous cycle: try finding a way to make her life even a little bit easier without expecting anything in return. If you help solve her problems, she might help solve yours, and you can start functioning as a team.