L.C.
I've been taking a low dose of Buspar (5mg twice daily) that has really helped. It makes sense that you would have more anxiety in the evening/night. Things quiet down around the house, but your mind is still going full speed. Your body is tired then as well. Exercise may help also.
I went to the doctor thinking I had high blood pressure because my blood pressure would spike when I would get upset about something. I mean like 150/110. My pulse would race and my face would get really hot. My doc said (after a month of keeping a blood pressure log) that my blood pressure was fine, but my anxiety was out of control.
Talk to your doctor. It's really not a difficult fix. You may have to try a few different medications before you find one that works well for you, but when you do its a big relief. My husband has really noticed the difference in me - when he gets home from work, I'm like "hey, babe. how's it going" instead of freaking out about something. Good luck to you!