Sounds like me... and might be fibro... according to a new book... and many web sites.
I've had dry extremely itchy skin (one allerg. dxed it as: pre-neurodermitis) all over for 40 years, so way before fibro.
After sjögren's (autoimmune) being suspected at the mo, I was part-happy seeing it explains my somewhat dry eyes and dry mouth.
Researching showed me that it can also explain dry skin, dry throat etc., i.e. sicca-syndrome all over.
But then I read a new fibro-book by a doc where I for the first time read that dry eyes & dry mouth can also be found in fibro.
And: also dry skin. Just look it up, there's plenty of pages.
My dry skin does not like any lotions or any soaps at all, so I only carefully & quickly soap (sensitive-type) the vital places,
and they are OK with that.
I also keep contact to water down. When it started off years ago radically for 6 months. Then keeping showers short (5 mins. at most), no baths.
Swimming & aquajogging again now in the clinic was OK up to 20 mins, 30 mins was a bit too much.
And for all sicca-problems drinking more should help, that's what now motivates me (at last...) to drink 2 litres before 2pm.
(My gut burns from fizz (acidic), pure water like all herb teas act diuretic on me - praps also sicca-style?? - soy milk works best for me, got used to the weird taste..., wheat & rice drinks give me heartburn in these amounts.)
And I can only wear cotton, no synthetics anywhere, day or night (thanks sunkacola for reminding me).
If (when) I didn't do all this, the itching would make (made) me go mad and scream.