I have a crawling sensation in my legs, butt, abdomen, lower back, arms, face and head. I feel shaky and weak. I have loose stool and abdomen cramping. My eye also twitches sometimes and I'm starting to have loss of appetite. Lastly, three days ago I saw a white stringy thing, about 6 inches, in my stool. It wasn't moving so I don't know if it was a parasite or not. Everyday it seems like the crawling sensations increase throughout my body. What should I do? What could be wrong with me?