I have an 11yr old tabby house cat who has never cared for other people to come inside our house, but the last 2 times this past month, she turns aggressive with us afterword the rest of the day (not so much with me, but with my husband). She growls and cries like a really scared cat and won't let us walk past her for hours. We have put her in the basement for the night, and in the morning she is back to the very affectionate cat she is. ??? Any sugge stions?