Only a doctor's exam, if anything, will tell you if the head rush and dizziness are something physical or not. Stress isn't the same thing as anxiety. Everyone goes through more and less stressful periods of time. Anxiety is a problem when it's chronic, and you seem to be describing a chronic insecurity and fear. When you find yourself Googling symptoms, it's always a problem because the same symptoms can be a sign of a thousand things and nothing at all, so it's useless -- it can be helpful when you get a diagnosis and treatment plan, but not to self-diagnose. So I'd ask, what have you done to try to get out from under this anxiety problem? I'd think therapy would be in order given this seems to be a long-running problem. As for your cat, a cat that doesn't try to escape confinement is probably not a well cat. While we do like them to be confined and it's a lot better for local wildlife to do so, cats are not dogs and don't take to confinement well at all. Cats aren't gregarious animals the way dogs are and have only one real enjoyment in life, which is to hunt. In the wild, they basically hunt and sleep and not a whole lot else. I say this hoping this will reduce your stress over it -- as long as you own cats you will find you can't really own a cat -- they tolerate us, but again, they're not dogs, they're not pack animals. It's normal for them to do this and normal for you to try to prevent them from doing this. I hope this takes some of the stress away from it.