(((lav))) I read in chat... sorry the puppy is one more thing that can't be kept in your life. (I was secretly hoping you'd find a neighbor to take it.)
Is there any place you can call with nurses and free info? Sigh... You didn't go to the hospital after the accident? While you wouldn't still have a concussion, if these symptoms have been happening all this time, you really shouldn't dx yourself, but see a professional.
I do realize you've posted this is the Anxiety Forum... and it's quite natural, with high anxiety, to feel like you want to -or will- die. Did you know this? Anxiety can cause all types of symptoms. But if you aren't able to calm yourself then again, at least see someone about this torturing anxiety.