Definitely go to another GP.
However, in the meantime, why not try a really serious 'anti-piles' () regime?
Cream every morning, every night and after a poo.
And use a suppository at the same time (so you're dealing with internal as well as external), and get yourself some antihistamines to deal with the itching. Find one that is a drowsy one and take it at night, so that you sleep better and aren't scrtching during the night - which is when you're probably doing most damage.
And a bath each night with some tea tree oil could also help soothe inflamed skin.
Not that I've ever suffered myself!