have a chat with your doctor - propanalol (a beta-blocker) is good for dealing with the heart-pounding, shaking, sweating kind of nervousness. other, more "human therapeutic" types of solutions can involve the Talking Therapies, such as Cognitive Behavioural Therapy (CBT) which can sometimes better address the problem. (in my experience, a bit of disinterested human input can often be the best first step). otherwise, there are other options, but it depends where the problem stems from...