This is essentially what panic disorder is. If you want some things to try, eating foods higher in tryptophan should help, and you can look into supplements as well.

panic attacks are caused by your thougts expeically negative thoughts... a good way to work with panic attacks is to work with your thoughts.. get a notebook and every single bad thought you have write it down, save a space under each one and re write a postive thought for your negative thought....

for example

negative thought: what if i have a panic attack that is scary like my other one?

postive: oh well if i have a scary panic attack, they cannot kill me, and they always pass

oh i used to have that symtom alll the time, for a couple of weeks, now i used to get panic attacks with out knowing what it was so i thought i was really dying, and everytime i thought about that first one, i get a full blown panic attack, it was horrible