I don't know if any of this might apply in your cases or not, but just wanted to mention it - just in case..

If you ever had any upper body/head hit, car wreck, fall, sport injury...

[POSTURE IS A WINDOW INTO A PERSON'S HEALTH
Upper Cervical misalignment = Poor Posture = Poor Health

The following Signs and Symptoms may indicate Upper Cervical (c0-c1-c2) Injury

C0 – skull or occiput; C1 – atlas; C2 - axis]
more info on this whole site-
http://www.upcspine.com/self.htm

If it sounds like something that you want to learn more about you can do a Google search & also for videos showing it.

My chiro did this for me - I had taken a fall off my horse ages ago -when age 15 - and also backyard sports and tomboy adventures and falls, lots of rough & tumble play with neighbors & brothers as a kid..
and a minor car accident at age 20 - hit head on steering wheel pretty hard - all these things added up- plus hyper-mobility
so was easy for me to get messed up - then add on top a highly repetitious & 10 work day x 15 yrs...

just something to think back on and add up any little things that all can take a toll..
and if they fit, maybe upper cervical might help.