Get some lotion with oatmeal in it. Avon has some, Aveeno, any one of those should help. It sounds like extremely dry skin. I get like that when I am somewhere that has dry air inside. I use Avon Moisture Therapy Lotion in both the bottle, pot, and the tube. they are white with blue lids. They have 3 tear drops on the front label.
There are many products out there, even the Gold Bond anti itch lotion can be wonderful.
Here is a link to the Avon page that lists each of their Moisture Therapy line.
Something else you might try is changing your laundry soap, softener, and dryer sheets. Sometimes the clothes we put on have been washed in a different combination that what we wore yesterday. I had on some pants that were driving me crazy with a ring around the waist that was itching like crazy. I realized I had washed the darks with an off brand of liquid laundry soap when I didn't have the money to get the regular Gain. It was the soap and only on the pants, nothing else.
Dry skin isn't always effected by the amount of fluids we drink. If it did then everyone who drank lots of water might have sweaty skin all the time. Dry skin sometimes just needs something on it to keep it's moisture from evaporating.