Middle age crisis can go on for a few years. You can be married with younger kids, and older parent needing geriatric care that you have to find the time for, besides your children and your spouse and job. And you have no time for you and that is where mostly the middle age crisis comes in. One must learn to grab the moments of peace and sanity while they can, to manage ME time especially when needed and not feel guilty about it.
We throw away batteries that lose their charge, but we can't do that to people. Instead they go away to be recharged. Don't let your charge get so low that that happens to you. Take care of yourself if you are a care taker of any kind... blessings and tc