>I smacked the cat really hard and screamed at her.

This is wrong and is only going to make the situation worse. I would ask the moderator to put a trigger warning on your post, but I don't know how to do that, so I'm asking you.

The cat has been peeing for years and you haven't figured out how to soothe the cat, so you are probably not going to figure it out now. If you have craigslist in the area, try to get someone who will adopt the cat since you can't handle it. Until then, I suggest confining the cat in the bathroom. Peeing in there will be much less trouble and won't disturb your bedding.