Dry mouth, increased urination, hair los

Last few weeks have noticed a change in my health, with the following symptoms: 1) sensation of having a dry mouth - even though it's not, even after drinking; almost like thirst, mainly occurring in the evenings (though that could be when I'm most aware of it). 2) increased urination at night - I have always been able to hold it through the night, and most nights I have undisturbed sleep. But on three consecutive weeks I've had one or two nights, where I have had to get up three or four times to urinate. I have a pretty standard routine of liquids throughout the day, and didn't have anything different on these days. 3) sudden hair loss on my thighs, approximately half way between hip and knee, approximately the size of my hand. 4) generally feeling under the weather; mildly fatigued, bunged up. I am a single parent to a child under 2, who always comes back from playgroup with a new cold. But I seem to have had a cold, without a break, since October. 38-yo male.