it does sound like you might have some kind of parasite or microbial infection and you could do with some cleansing. parasites as well as constipation both mean an increase in the toxins in your bowel, and the blood supply from your bowel goes straight to your liver, so a toic bowel can really over burden your liver and cause the symptoms you have.
The first thing you need to do before touching the paragone is to get your bowel moving and get yourself regular, and you also need to restore some balance to the bacteria in your bowel. Talk to the doctors to see what they can do to get your bowel moving (acupuncture works great for that, or enemas, or colonics if you can find somewhere), and see what good bacteria you can find - that's yoghurt, acidophilus and bifidobacteria supplements, or there's probably something local that you can find in health food stores or herbalists.
Drink 2 liters of filtered water a day, and take some fiber supplements as long as they don't slow your bowel down.
once things get more regular for you, then you can start the paragone, and take a good multivitamin at the same time. You might need to do 2 kits though.
that's my advice anyway, good luck with it. oh and I'd do the chinese liver stuff.