Severe back pain only when laying down, at night, or standing after sitting. Switching positions in bed does nothing. Bad Headache when awake?

Pelvic girdle ? 38y w. HA, back pain lying/standing, not sitting. Sitting: both ischial prominences contact seat surface forcing sacroiliac joints, SIJ, into neutral anatomic positions. Sleep: surface ground forces translate around pelvic bony ring to loose/pained SIJ. Standing: upper body weight upon SIJ's; torquing loose SIJ. Loose SIJ evokes functional scoliosis as upright, head tilt & neck muscle tension HA.