maybe I'm cynical but I don't believe the doc. If he "can't" do anything more, should he really be doing that job?
grrrrrrrrrrowl at that doctor. Remember doctors are our employees, they are there to HELP us.
They are never gods, and they are not always right.

What I've found helpful sometimes is writing down how I feel (or some of how I feel) and giving it to the GP to read. And maybe its time to insist on a referral.

Sorry if this is blunt, I've been where you are (more than once) and it sucks.