@acemoose
I can empathize. I have right hip flexor pain from crotch to upper thigh to outer hip. I had lumbar spine surgery last year and wasn’t sure if related. It started 3 months after surgery. I had MRIs of lumbar spine and hips. No arthritis in hip but it showed I had bilateral gluteal tendinopathy and bilateral hamstring tears (not sure how I got these). I had severe stenosis and neurogenic claudication which caused lower back, hip, buttock, leg, and foot pain/numbness and weakness. Much improved after surgery until the excruciating pain in my right hip flexor started. I am not sure if this is tied to the gluteal/hamstring issue,surgery or nerve healing after being compressed so long. I also was told at some point a while ago I had sciatica but pt did not help at all.

It would be good for you to get Xrays/MRIs of your lumbar spine and hips (by orthopedic specialists) plus see a neurologist for EMG/nerve conduction studies of your lower limbs.