Sick and confused... help?

Hey all,

First of all, I need to warn you all that I'm not very educated in the ways of parasites or natural medicine. I'm feeling really overwhelmed with all of the competing theories of natural treatment out there, and am just looking for a little beginner's help.

I'm not sure if I have a parasite problem. I think I must.

The nausea is so bad. I suffer from chronic nausea anyway, for a variety of reasons, but this nausea is different. It's almost like a place in my abdomen, right behind my navel, itches, and I makes me sick. I wake up late at night, at 2 or 3 in the morning, feeling dreadful. I may throw up some times. I have rectal itching and poor digestion. My skin itches. Insomnia and fatigue is horrendous. My lips have become abnormally dry since these other symptoms started.

Five years ago, I was sick in this very same way. I was so nauseated, and ate so infrequently, that I lost 30 pounds. I went to the doctor, who said "sounds like a parasite," but stool samples showed nothing. I wasn't prescribed anything, and I felt better after a couple of months.

I've just started taking this stuff called ParaFree; it has Black-Walnut , Wormwood , cloves, and male fern in it.

Is this a good start? Is the male fern dangerous? Should I take a heavier dose than the bottle says (40 drops, three times a day)? I always notice that within an hour of taking it, I feel a lot better, but later the symptoms return. I'm only four days in, but I'm always constipated anyway and haven't had a bowl movement. I gave myself an enema, and some stuff came out, but I didn't see anything suspicious.

I've just ordered some diotamaceous earth.

Please help this newbie. I am so miserable.