My husband had a stroke a couple of months ago, he only urinates once or twice some days, one day he did not urinate at all, he does drink water during the day, this really concerns me as he will go 15 to 20 hours without urinating. Last night he urinated at 5:33 P.M. and here it is 11:40 A.M. today and he hasn't gone to the bathroom yet. Is this normal?