I also have the shallow breathing. I am 35 years old. I just recently had my first panic attack in almost 15 years. I first developed panic disorder when I was in my early 20's. At that time I didn't know anything about it. I thought I was dieing or going crazy. It took me almost 2 years to feel "normal" again. I didn't take any meds or anything because doctors kept telling me nothing was wrong with me. I was also afraid of medicine. Anyway, I dont' mean to get off topic. One of the first things that happen to me is the shallow breathing. It scares the hell out of you. You think you can't breathe, or you're going to pass out. But in reality you're not, it's only because that's all you focus on at the time.. The feeling may last for several days, or at least until you subconsciously realize that you can still breathe. I do take Zoloft now. I'm going on 2 months. It has helped tremendously. I still get very anxious at times, but I've not had a panic attack. I get the breathing stuff once in a while, but I try to redirect my thoughts. I don't know if this helps or not, but I sure understand what you're going through. Hang in there.