Is it possible for you to take some sort of leave from work?

Yes, you definitely need to see a doctor. Sometimes these things only get worse. It's not like having the flu where it gets better with time. Not always, anyway.

Don't feel like a failure. No, not everyone can handle the stress of jobs. I can't. I'm self-employed because I simply can't do it anymore. Sometimes the future scares me, but I can't imagine working for someone and having a boss create stress in my life.

But please get help for the panic. Don't wait like I did. I ended up rolling around in the front yard, gasping for air and drooling on myself.
You need to stay ahead of this thing before it takes total control of you.