Hi, I too suffer from GAD, but the one thing I have come to understand and has helped me considerable is that most GAD suffers worry about everything. Like you mention, sharp or head pains, cancer..but it's not , only a plain ole headache. I finally got to the point where I was tired of thinking I was going to go insane, and a good friend of mine, helped me realize, I was over reacting considering I went to the doctors and they found nothing,(I found that going to the ER and everyone knows your name was quite embarrassing
just anxiety. Today I lead a normal life, I do anything and everything I feel like. I am so grateful for not letting my mind take over and just assume I am have every sickness there is. You have to have faith, and I did and still do. I wake up everyday and excersise, and just relax. I found that I wasted more time worrying about every little thing, that it affected friendships, and relstionships.
So I sort of grew up in a sense, and come to terms that I have anxiety/panic attacks, but I CAN CONTROL IT, and I am not going to let it control me! The mind is a very powerful tool, I just to learned how to use mine and put it at ease. I am healthy and will continue to be so.