I'd like to join Sophie_M in welcoming you to the Forum. That was a good move on your part as here you will see others with similar problems.
I too get chest pain and other symptoms like yours and have been tested umpteen times. I've been to ER more than once and even had a CAT scans with Iodine and an MRI. All came back normal. It was very hard to accept that these, and before that other physical symptoms, were caused by my mental condition. I now accept that, though not wihtout a long struggle wondering if the tests were done properly or my condition intermittent and so on.
It is excellent you have had the physical side properly checked out. May I ask if you are under medical treatment for your anxiety? I found I simply could not make myself better and my improvement started after I was receiving the correct therapy and meds.
Now most of my physical symptoms are understood and mostly under control, panic attacks are very rare nowadays and I can enjoy life, taking sensible precautions where I can not to raise my stress levels.
Anxiety can cause great bodily reactions, and it needs the basic anxiety level reduced to make matters better. If you do already have therapy I would expect it would be worth reporting that it is very ineffective and needs a review, if not of course please start. Sophie has give you some useful links.
Do you have anyone in your life, family or friend perhaps, you can go to and talk with and feel cared for? Trying to cope with all this on your own is very hard, leaning on someone else if you can realy helps.
So to answer you request, now that you have spoken of all the tests you have undergone, firstly I do not think you are not crazy (or no more than me anyway:) and secondly panic attacks make you feel you are dying, even though you are not.
Is this of any help, please say what you think?