i'm sorry mac. but it would be hard for any of us to say what might be wrong.

do you have a primary care dr?
it might be worth considering getting some short term counseling just to talk your fears out with a professional.

they have been a great help to me.
my dr has helped me to redirect my thinking into positive way.
a counselor can help you decrease your anxiety also.

i would talk to your regular dr and tell him how you feel.
then maybe he can make a good referral for you.