Ok, since you have been checked out medically numerous times with the appropriate testing, it would time for you to focus on treating your mental health challenges. Do not feel alone, there are so many peeps who have to learn how to live best alongside, in accord with, their anxiety / panic issues. It CAN be done. Easy? Prob not....but in the end you will be thankful that you put in the effort and acceptance. And, your life can be awesome....which is probably not what you are envisioning currently, as we tend to feel pretty helpless and hopeless, at times, as we are moving towards a healing path. Do not let anxiety / panic make you feel that you are in the group of peeps that might be "too far gone", so to speak. We can often feel this way...all of us:) Overwhelmingly, most of us can find some lasting peace:)
Try to have some compassion for yourself and try to not let 'guilt' creep, too much, into the equation. Asking 'why me?', which is common (I did it, once upon a time), will not lead you to some relief. Acceptance and then a dedicated (yet calm) approach to your treatment is what's need, IMHO. One of the more difficult things to face with seeking treatment for anxiety / panic is what WE feel others might think about us. This can be tough, but we do have to keep in mind that these type issues tend to NOT simply go away on their own and, in actuality, if we do not get the appropriate help and learn how to best help ourselves, then the issues tend to amplify. So, that said, it is imperative that we DO continue seeking out help and learning what we can do (our own self-help) to move towards a healing path and we just cannot let what we feel others might think dictate our actions. And, often, with anxiety / panic, we tend to have some pretty wild intrusive thoughts about what others are thinking and saying about us....and most often it isn't nearly to the level we believe in our amped up minds. You health (physical and mental) have to come first, of course....or all else tends to keep on sliding more and more out of our control.
Again, we CAN learn how to live very well with anxiety and panic. It does NOT have to define us:)
Peace and Feel Well:)