Hi, I am so sorry you are having problems, I went through hell as well for weeks before I was diagnosed with TMJ, and I had the worse kind you could have, My throat was tight like yours, couldnt breathe, coughing, etc, and I too finally had a panic attack, I am on paxil CR still, for 1 1/2 years now, and was on xanax for about one year, I got off of that, but it did help me tremendously. I would highly recommend it, you do have to wean yourself off though, and doctor can help you with that. PLEASE read the book, TAKING CONTROL OF TMJ, it saved my life and explained so much about this horrible disorder. Mine was so bad docs thought I had MS for awhile or even Lupus.
The main thing to know is to try to stay calm and relax, I had to go through extensive physical therapy to get over all my pain in my head, neck, and shoulders, and even my back too. It is really something how your jaw can affect the rest of your body and the more knowledgeable you are the better off you will be, I diagnosed myself and with the help of my TMJ Dentist got better, I NEVER thought I would be better, but I am. I still have to wear my splint at night and get just occasional head pings or pains but thats it.
GOOD LUCK to you and please ask me anything else. I can honestly say I am an expert on TMJ and never wanted to be. Take Care, Tina