Sorry that you're feeling so bad. I find posting on this site helps me not to feel so alone. I hope that it will do the same for you at least a little.
Your symptoms sound a bit like the acute anxiety that I suffered when I was at my worst. Do you think it might be worth speaking to a doctor? Perhaps if they could give you something that would give you a respite from feeling like you're " driving yourself crazy ", that may help you a little? ( Although, that's just a thought. I have no medical training whatsoever, unless you count watching Dr Leonard McCoy on Star Trek!

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For whatever it may be worth, you're not along in feeling the way you do...( I hope that doesn't sound too cliched!

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