I had bloodwork done last month, nurse said probably nerves also. wbc. etc normal, but have all the signs of parasite's itching, biting, tired etc. loss of weight. I do not think it a colon thing, did a Wormwood /walnut hull/cloves regiment, but still happening. I guess it could be nerves, but really feels more a biting and moving, and heard most parasites go under the traditional medicine tests' radar.