Panic Attacks... what's causing them?

I have been crippled with devastating Panic Attacks since the age of 15. Now 24, this has sadly just become a part of my worrisome life wondering when and where it will strike again. It's a horrible way to live life...

Recently, I have observed how my attacks have been closely related to what I do or don't eat. I am convinced I have Reactive Hypoglycemia, but my doctor is not.

I first visited my doctor because every day I would feel incredibly sick; weak, achy, dizzy, nauseous and I would have terrible tremors, and with these often came Panic Attacks. This would typically happen during the afternoon time, but in the mornings and late evenings I would usually feel better. This went on for a couple of months until I realized that this was no flu... I Googled my symptoms and over and over again Diabetes came up. I was convinced. So many of the Hypoglycemic Symptoms displayed were the same things I've been experiencing. To my dismay, my doctor had me tested and the results were negative... So what was going on?

My doctor left me feeling hopeless and gave me absolutely no answers nor showed any sign that he was going to try and figure it out... Instead, my Anxiety Disorder was to blame. It was all in my head... F**K!

The problem persisted and I tried all the positive thinking, meditation stuff there is. Did it help? Yes, it helped my anxiety but not when I was experiencing what I still believe to be a Hypoglycemic Episode. When I am experiencing the tremors, sweats, nauseousness, weakness, etc., there's nothing I can do, only try to keep my mind from making the situation worse, at best.

Eventually I returned to my doctors and insisted I get tested for Hypoglycemia... Not exactly sure what the test was called or did but it had something to do with testing my Blood Sugar Levels history. When I went back to see him, he told me that he was not surprised to find my levels were "not significantly low" and if he were to refer me it would take many months for a nutritionist to even consider seeing me because my levels were not low enough. He was going to provide me with a meter and strips but he had no strips available and I can't afford $100 for 60 of them... Damn! Still left with nothing...