weird feelings and dryness, dehydration.

I have noticed weird thing. At night I feel cold and wake up to pull sheet on me but as soon as my body moves I feel intense hot and give up the idea of pulling the sheet on me. The Same thing happens when I sit on the chair for long, all my body freezes and my body muscle become stiff. I feel difficulty in getting up from the chair.After I move around for a bit I feel better. Why? looks like my blood supply is not reaching the muscles?
Another thing I am constantly dehydrating and drying up fast. my skin is very dull, and dry now. I drink water and it goes straight through. I have to run to wash room to pee. I eat and after few hour I have to to toilet. Before SP sides I used to drink 12 - 16 glasses of water but was not rushing to pee like now. I now drink only 4 -5 glasses, after forcing myself because I don’t feel thirsty like before.

Yeap, I got that too.