My cat is about 16. This last year she has been yowling a lot. Recently she is crying a lot. Almost screaming. Not a yowl she has ever made before. There doesn't always seem to be a reason for it. She gets food, water, (which seems to be challenging for her to drink for some reason) and goes outside when she wants a little air. Mostly she lives inside and has a box to go in and a warm place to sleep. Her activity level is the same and she seems to hear and see and "go" fine. I've heard old cats sometimes vocalize strangely? Anyone know anything about that?