These are the symptoms...(mental disorder?) Kind of long :(?

I have an appointment with my family doctor in about a week for a physical, then I'm going to make one with a psychiatrist. My symptoms are: dizziness, racing heart, irrational fear that I'll p out and "cause a scene," worry over every little thing imaginable, and just feeling "unwell." Lights seem too bright, and everything just seems--surreal. I've had several of these panicky/nervous episodes while on the train (I commute to work), while out shopping with my kids, and most recently at work. Now, every time I get on the train or go out shopping or get to work, the thought of "Am I going to have one of these episodes" COMPLETELY consumes me, and makes me feel horrible. What could this be? I've been reading up online, and there are SO many different conditions. Anyone out there have any idea what this could be? I'm tired of trying to go to sleep every night, and ending up crying because I just want to feel NORMAL again... :(