I feel ya man. I've suffered with pretty much the same symptoms as you for most of my life. Friends and family are always saying, "What's wrong with you now?" I started having anxiety and panic attacks about two years ago. They got so bad that I would go into the washroom at work and puke!
When I went to the doctor, he suggested that I go on anti-depressants! No way I was gonna do that, so I learned to somehow live with it. I've had two major attacks in the last four months where I had to go to the E.R. They did blood tests and of course found nothing wrong with me.
The good news is, ever since I started taking care of my health I no longer have panic attacks. occasionally, I do get slightly jittery nerves, but nothing like before. Things will get better!