Sorry to hear this.
It might be easier to take if you were 20 years older, but mid-life, not so much.
I'm a year older than you, and have undiagnosed hip pain. No reason to suspect FAI (had to google that, btw), probably just overworked muscles & tendons. I guess I figured assorted aches and pains are part of getting older - a part that we can hopefully reduce/correct or maybe even avoid by getting fit.
By way of encouragement, I would suggest hiking with a group (if you're able to continue hiking at all) and depend on somebody else to carry some of your weight. Stick to easier trails, or shorter trips. But don't stay home. The wilderness needs you to steal out into the woods now and then.