First of all here is a link that might help with your panic attacks!
http://www.paniccenter.net/
my son has a panic disorder and it is very real and he is convinced he has many different diseases.. i didn't think about it then.. but when he was young he use to worry about spontanious combustion! But the good thing is he has had everything in the world checked out.. and knows that his health is good, except for some acid reflux.. so when his anxiety flares up he knows that it is just anxiety!
Yes i agree with everyone here go see a dr. go to a county hospital or state run hospital they have lots of programs to help people get seen! until then, try not to eat anything white! Rice, potatoes, white bread, pop corn etc.. and try to keep your carbs under 40 per meal.. stay away from soda pop, (you can drink diet) and fruit juices are high in carbs also..
let us know what you find out
mike