I have been suffering from anxiety, panic attacks, and agoraphobia for many years. In my experience, and I repeat, in MY experience medication and doctors have been VERY ineffective and in fact, HARMFUL to my health. And believe me when I say that I seen many, many doctors, and took countless meds. The best person that can help you is yourself. Now, when I say this I dont mean that you shouldn't seek help from others. What I mean is, once you find out what needs to be done, YOU must do it, and not rely on someone to literally save you from your problems and cure you.
Here are my suggestions:
1)The mental conditioning is VERY important. You must constantly do mental work every single day, like a religious man. By mental work I mean that you have to spend 10-20 minutes every day to quietly sit down and imagine that you are a healthy, confident person. Feel the strength and health inside you. Keep telling yourself that you are fine. When starting out, a suggestion like this seems silly/stupid to many people. It is also very hard to sit quietly and imagine/think about these things. However if you want to succeed, you must do this and believe in it. all you have to know if that it works, and it worked for many people. This is a form of meditation.
Another basic thing you should do is breathing meditation. Sit down, close your eyes, and focus on your breathing. think about only your breath, and block out everything else that is coming up in your mind. Do this for as long as you can but no need to do it more than 20-30 min or so. Even if you do it for only 5 minutes, it is still beneficial.
2)Exercise/workouts are very important. It has been scientifically proven that they help reduce stress.
3)Deprive yourself of "free" time. Find something to do all the time. And by something to do I dont mean go watch TV or play a video game. What I mean is go do some house chores - vacuum the floor, wash the dishes... Learn something new like playing a musical instrument, or read a book about something interesting. Take a tai-chi/yoga class. Maybe a martial art class like aikido or kung fu.
4)Most importantly you need to WANT to help yourself. You need to act upon wanting to help yourself and not just talk about it.
Going to a doctor and swallowing pills is easy. By doing this you are admitting that you are powerless to change anything about yourself and putting all hope into this doctor or this pill.
You did the right thing my getting an MRI, taking some tests... But going to a psychiatrist is another matter altogether. People have told me countless times that seeing a shrink is nothing to be ashamed of, he will no turn you into a vegetable with his pills, he will help you etc. I listened and went along with it. Boy was I wrong... Just take my word for it.
If you feel you must, go ahead and see a shrink, take his pills, etc. But have the courage to say ENOUGH! if you feel that the treatment is not helping or harming you.
Hope this helps, and remember that I am not a qualified medical professional. I'm only trying to help. You have your own head, and you should always make your decisions by yourself.