I Have Gained Weight Even Though I Don't Eat Anything

I have gained weight even though I don't eat anything most days. I get thirsty for milk and I go to the bathroom all day. I usually have runny stools in the am. My skin is very dry and flaky and I am always rubbing my eyes to see better. I have no energy and I lay or sleep on the lounge all day. I also have very poor concentration and I am a bit shaky. Does this sound like anything in particular ? Thank you....Jen.