Midlife means ONE crisis, I think I get one of those every 10 to 15 years. This is how I became crazy about preparedness a few years earlier.
Time comes when you stop and ask yourself lots of questions. I think if all your questions deal with yourself, its a bit easier problem. If it has to do somehow with your spouse, then Its a bit harder.
The best thing to do is take it easy. Even if you feel it is a must to change things , change things slowly. You have been "stuck" with those things for years and cant hurt to keep them a bit longer. If your spouse is a good listener that is a plus. If not, let your favourite belifs and or hobbies help sooth your pains and help you move ahead at a comfortable pace. Comfortable for you and your loved ones.
Good luck