Hello. It's nice to hear from you again!
I am a little baffled about something you said. Anxiety attacks and panic attacks are the same thing. So I am not clear on the difference the doctor is making. He may mean something else, I am not sure.
From what you said, I believe it is your thought process that is making you more fearful. You are focused on the medication working and when you have anxiety, anything you focus on becomes an opportunity to be anxious. It is a good thing to know that anxious people tend to be very highly intelligent. And when they focus on something, it can be intense. The nature of anxiety is an over focus on thoughts and feelings to the point of creating anxiety and panic. Just from talking with you the past week or so, your focus has been the medication and it's ability to help you. If you feel that it is not helping, you are going to feel anxious about it. That is very normal for someone who has anxiety disorder.
Also, the idea that "something" is wrong and your doctor can't figure it out is frightening. When you have anxiety, hearing something concrete is comforting. You know where you stand. But hearing that something is wrong but there is no answer to what it could be is very anxiety arousing, even to people who do not have anxiety.
What you can do is realize that you are ok. The nature of anxiety is to second guess, be fearful and be ever vigilant. Give the medication time to work. Try other methods of reducing your anxiety, such as the books I recommended in the meanwhile. They will offer much reassurance from people who understand anxiety and/or have gone through it.
And if it makes you feel better, have a full medical endocrine workup. That will tell you if anything is wrong that can cause your medication to not work (such as hyperthyroidism). But it is probably not necessary. What you describe is classic anxiety.
And you are doing very well handling it.
Keep me posted on how it goes with the doctor.