discomfort, anti social

I have had occasions where I get almost a panic attack like symptoms and then can't eat because i feel full, or it make me sick to even look at the food.  I have constant burping, and even when I'm hungry now I don't like to eat. My panic attacks are not all the time, but my heart beats hard and fast, little dizzy, hot feeling and no appetite.  the doctors put me on prevacid and they seem to be working for some of the issues but how do I get over this no appetite.  i have seen lots of posts on this board, but not a lot of answers.  does anyone have a similiar situation that they found something medically wrong? Thanks