Most parasite tests are like trying to find a needle in a haystack. They are very unreliable. Let me try to diagnose you from your symptoms.
1. The liver is the primary purifying organ of the body. This means it has to process, filter and remove all toxins from the body. It ALSO has to produce 1 - 1 1/2 quarts of bile every day for good digestion. The liver cannot do both things very well if there is an overload of toxins.
2. When the liver is overloaded with toxins and bile production is lowered, digestion issues such as chronic constipation, chronic diarrhe (or a combo of both) nausea and bloating can occur.
3. These same toxins that are in your blood cross the myelin sheath covering your brain. This toxic irritation causes the central nervous system to be triggered. The central nervous system irritation can cause anxiety, extreme fatigue, depression and many other mental disturbances.
4. Yeast infections are a secondary infection that goes along with parasite infections. They stem from the body being out of balance.
You are not putting a lot of toxins (drugs, alcohol, etc.) into your body, so where are they coming from? Most likely from parasites as parasites put off toxins every day.