Just found out that I'm partially hypermobile and so many things make sense now
I went to the rheumatologist today for an unrelated reason (positive ANA counts in my bloodwork), and I found out that I'm partially hypermobile. I'm able to hyperextend my elbows, some of my fingers are double-jointed, and my arms/shoulders are quite flexible (I can do the reverse prayer easily). I don't meet the Beighton criteria for hypermobility for my fingers, hips, or knees though. However, after doing some research, I realized that I do very likely have neck hypermobility. I have mild double scoliosis, cervical kyposis, and have had chronic neck pain, tension, and headaches for YEARS. Even after seeing some physical therapists, I was never informed about possible hypermobility even though (according to me) I'm able to hyperextend my neck even with my horrific muscle tension.
For years and years I've had chronic muscle tension in my neck which has resulted in headaches, nausea, facial pressure, and a slew of other things, and only now am I realizing that it could've been hypermobility all along.
I don't know if I have hEDS or HSD at all, but I'm a little suspicious now.