So what kind of underlying problems should we be looking for? I've had many tests and the only thing that's ever been discovered is that I have a severe candida problem. My symptoms are SEVERE brain fog, weakness, constipation and heart palpitations.(It's not thyroid.) Many here have suggested parasites, but I've taken anti- parasite herbs before. I've taken chlorella for heavy metals but unfortunately it made me constipated. I can't function at all, so I'm at a loss here of what else could be wrong with me. I'm sure many others feel the same way.