Medication may help your situation although YOU SEEM VERY HEALTHY and it is just that being a doctor requires a healthiness ABOVE AND BEYOND what is healthy and normal for the rest of the population....as far as cost you may find a clinic with a sliding scale and I do believe the money will be worth it to save your career down the line and I do believe you will make a great doctor...here is a link that might help, too..

http://speech-anxiety.healthyplace2.com/

Hope to see you around the health field- I'm going to be a nurse