I agree with Paul, you should see improvements fairly immediately if you have found the right med. Do you really need to wait for Dr S? Even just reading Dr. Hains page and flowchart with your GP you could immediately start to work through a few options . Flowchart is at bottom of page:
They are all here: beta blocker, tricyclic, anti-convulsant, SSRI ... (although I don't believe all doctors are licenced to prescribe SSRI's)
At least that could make you more comfortable in the meantime ...