Just thought I'd throw this out there too, as I'd never heard of it before...
I started walking/jogging after I FIREd. I went from couch potato sedentary (desk job and then home to the couch and then bed) to doing 5 miles a day walking and riding my bike an additional couple of miles. In retrospect I was doing way too much too soon, but I was REALLY psyched and didn't want to waste the enthusiasm.
I developed a pretty bad shooting pain down my hip on one side, that extended from the top/side of my hip, through the buttock area, and down the thigh to my calf area. It was terrible - I would stiffen up within an hour of exercise and hobble like I was 100 years old (I'm early 40s). I bought new shoes, did the foam rolling, but none helped, and was starting to think it was going to be a doctor visit with shots.
Thought it was sciatica, but after doing more reading, learned about periformis syndrome and started doing yoga and other exercises specifically to target the nerves in that area, and making sure I had rest days as well. The pain is pretty much gone, just have occasional stiffness and mild soreness when I overdo it, but I'm keeping up with the stretches (the yoga and then the hip abduction ones like the clamshell, side leg lifts, etc. from the link below)
https://runnersconnect.net/running-injury-prevention/piriformis-syndrome-running/