"miserably backed up"...that has to be less than NO fun!!
If you have some uniodized Sea Salt , how about a "salt water flush" to unclog your system? Two teaspoons of Sea Salt to 1 quart of water. It can be warm if you would like or room temp. Drink and this should flush you. It can take as soon as 20 minutes to an hour....
why be miserable...after that, be sure to drink plenty of plain water with your juices!
Your colon might really benefit from a wheatgrass implant (enema) if you have plenty of grass....