Sorry been so long on update .
It turns out it’s not sacroiliac joints at all .
Long story short I ended up in hospital and MRI scan showed old fracture plus a couple of bulging discs ,
Now awaiting referral to come through for dexa scan and see osteoporosis specialist.
Currently using walking frame and can’t get out .
Blame for back problems according to discharge sheet ..... Polymyalgia plus early menopause and steroids 😳