For a week severely constipated with constant feeling of having to go. taking miralax (polyethylene glycol) that worked for one day. a little bright red blood in stool

Try Linzess..: Linzess will help...hydrate your self. Fleet's enema or mag citrate can be used also.

U need stronger Rx.: Try Milk of Magnesia( mint flavor).1 cap every 8-12 hrs until u go.Usually takes only 2-3 doses.If doesn't work after 24 hrs or so,a doctor visit is mandatory.Continue with the Miralax (polyethylene glycol) daily for mantinence and adjust according to stool consistency.If u require daily Miralax (polyethylene glycol) to stay regular,U need to get checked for secondary causes of chronic constipation.Once discovered,underlying problem solved