Grey,

I wish there was something I could do to ease your anxiety. Everything you are saying is a symptom that I have had at one time or another. I know when your going through it, it can be very difficult to deal with. Unbearable. Try sitting in your bedroom with the door closed and lie down on the floor. Close your eyes and put your arms out to the side. Take deep breathes. Slowly breath in and slowly exhale. Repeat this several times. Think about the anxiety and where you most feel it with in you. Weather it is your stomach, arms, legs, just whereever and concentrate on moving your anxiety away from that area. Slowly move it out and away from you. I know this sounds rediculous but my sx T had me try this excerise and it actually helped temporarily.

The bottom line is, its mind over matter or worry in this case. You have to control your anxiety. Dont let it control you. This is easier said then done and will require alot of re-conditioning in the way you think, feel and act. Slowly you must condition your mind to react calmly in anxious and tense moments.
I delt with this for months at a time. The clenched jaw, the lump in my throat, dizziness, blurry vision, tingling in my neck and back, weakness in my arms and legs. Tingling lips and what felt to me like my tongue would get numb (very weird). It would wash over me like a wave in the ocean and come back over and over again. Thats when I knew I needed to take control. Buying books on panic disorder is a good place to start. Not just one, buy a few. YOu will learn different techniques from each book. Its not an easy process nor is it a fast process. Baby steps. We are here for you always Grey. Take care my friend.