Bleeding in rectal, exam shows blood in stool & hemorrhoids, have loose stool, rare for solids. Can I use miralax (polyethylene glycol) safely to help loosen impacted stool?

Yes you can. Use a dose (17 gm packets) daily, but also recommend you start taking supplemental fiber (like metamucil or equivalent) along with. This will help you be more regular naturally. Once you feel you have "cleaned out" somewhat - stop the MiraLAX (polyethylene glycol) but continue the fiber on a daily basis. Also try warm soaks on your hemorrhoids, and topical creams with steroid (hc) may help, too.