What causes nausea, diarrhea and an urge to chew ice?

I drink only water but I only chew ice in excessive amounts of at least 9 - 32 oz glasses a day. My appetite has changed I can only eat small amounts throughout the day. I get nauseated at times and there s been days that I feel like I have diarrhea but when I go to the restroom all that comes out is completely clear fluid and it comes out even if I m trying to hold it to make it to the restroom. I often wake through the night to eat popcorn but either way if I do or don t I find that I m eating ice while I m asleep. I don t have medical insurance or a family doctor. I m 53 years old and 5.ft 4 in tall and weigh approximately 190 lbs.