living with panic attack disorder

i have been dealing with panic attacks for a few months and did not know about it, i thought i was having a heart attack, so go to ER and all tests are good. tell me i am having a panic attack. so know with heart disease, no gallbladder i have to deal with panic attacks when they accure. i have learned some ideas to help from friends and internet. but for when i get a full blown attack its hard to calm down. know knowing i have this i find out i am not alone with this panic attack disease. i sometimes afraid to go out and enjoy life for i might have one and no one to help me.  i try to not worry about any thing and live my life the way i like to and have fun.  when i do get a panic attack it starts with a head ache so i know i am getting one, so i site and relax, take my klonpin pill and rest for it will take me for a loop and later my attack is gone.   the thing i would like to know is why or what causes a panic attack? no one knows! it comes out of no where and any time for no reason.  something about seritonin i have read on line, so what causes the seritonin to cause a panic attack??  not enough iron, protein, vitemins? i eat well, see my regular Dr and heart Dr on a montly basis, blood work every 3 to 6 months.   so what can Dr do about this horible thing people get besides drugs and make the drug company rich and us poor??? guess we all have to take 1 day at a time and live 1 day at a time.   the sad thing is when we get a panic attack the family or freinds dont know what its like to have a panic attack and what we are feeling besides what we tell them it feels like.  i put a happy face for every one to smile and be happy