yep! not normal. There's positive healing crisis and then there's just plain FEELING BAD. But people are so out of touch with their bodies, they take bad information over what their bodies are telling them! that's the brain/ego saying "I reign supreme" and you have to watch that.
Distilled water will leach out essential minerals. It is only appropriate to drink or use in an enema after exposure to heavy metals. So use the Britta and start saving up your money for a good reverse-osmosis filter. Or find a "Water Etc" store or something similar near you. They use no less than 4 filters and the water is so pure the ice is clear. Add a bit of trace minerals back to it and presto! great water.