Thank you for replying - I don't mind lots of questions at all, it is nice of you to take an interest.

I went for Nerve Con.Study to investigate for Tarsal Tunnel syndrome. I've had 2 studies done the first showed neurogenic changes to the left ADQ. The medial plantar nerve, sural DPN and Tibial nerves were normal.
The second test said there was no evidence of TT syndrome or peripheral neuropathy. Suggested it may be SI radicular dysfunction..
I have not had any of the traumatic injuries that you mention, and no children.
The only clue may be my sacral area used to get a bit sore after running but not painful.
I did lots of ballet and gymnastics as a child and started to do yoga regularly after my injury.
After 1 year the pain then started in my left hip area. Hip flexor feels a bit restricted when leg moves into extension. The sacral area on the left can be painful and the area over the left side of my pelvis can also be a bit painful.

My current wonders are could it be Piriformis syndrome? SI dysfunction, or just chronic pain from misfiring sensory nerves?

Thank you!