"I've had fairly low energy levels, irregular bowel movements... fuzzy brain syndrome...allergic reactions to many foods."
Low engery levels can be related to digestive disorders, but there's plenty of non-digestive causes as well. Irregular bowel movements obviously relate to possible digestive disorders, and food allergies are often caused by "leaky gut" or related wastes/toxins in the gut. The short explanation of leaky gut: A pathogen or condition (candida yeast overgrowth is a classic example) harms the lining of the gut via waste and toxin output (the "pee/poop" excreted by candida includes many known and harmful toxins), with these wastes/toxins actually permeating the compromised gut lining and entering the bloodstream. Once there, the immune system attacks same. Certain foods can trigger such reactions when their byproducts also get past the gut lining and into the bloodstream (a healthy intestinal lining wouldn't allow this to happen), causing allergies to such foods.
My first suggestion would be have a comprehensive stool analysis done through a premier gastrointestinal lab such as Great Plains in Kansas or Doctor's Data in Illinois (two labs but same company), or Great Smokies in North Carolina. All have websites and physician referral services. Should you have a parasitic infection, yeast overgrowth, or gut bacterial imbalance, these typically show up in such tests. (Sometimes worm infections will be missed, but that's a concern to worry about later. If necessary, a blood serum test can accurately confirm/deny the presence of a given worm species.)
If anything, your conditions sound to me like possible candida overgrowth. The Candida Forum gets into this in depth. I'd suggest taking the "Candida Questionnaire," and then a Candida blood test and/or stool analysis depending on questionnaire results. Good luck!