Constipated since early teens, I'm 39 with rectal bleeding, d-sect is blocked even picolax doesn't work? Been impacted 6times, with failed barium enema

See your doctor... Your symptoms of chronic constipation and rectal bleeding warrant a lower GI evaluation by a gastroenterologist. There are remedies available for the chronically constipated by prescription so see a specialist for further guidance. Good luck!
Dietary change, eval. Thourough eval by gastorneterologist, remove wheat and dairy for six months.