I always have to pee but doctors say they find nothing in my urine? could it be anxiety? how can i stop it

Need more info: I wonder if you urinate often small amount each time or actually excessive amount. Also wonder if you feel thirsty all the time and drink copious amount of fluid.

Frequent: urination is one of the classic 33 symptoms of anxiety. Have you talked with a psychologist about WHY you have anxiety? There are other possible medical causes that you might also check out (UTI's, etc.) but for now, here's a reference on anxiety: http://www.psychologyproductsandservices.com/page2.html