Cymbalta is for depression, but since depression and anxiety often go hand-in-hand, it helps many people with anxiety, too, just as other antidepressants, like Paxil do.
Your best bet is to see a physchiatrist. They are trained in this area and will be able to give you a full workup, diagnosis, and treatment plan. If you had a problem with your heart, you would see a cardiologist not a regular GP - the same thing applies here.... see a specialist in this area.