You could try wearing them for an hour or two, then take a break for a day, and then try again. That's worked for me before. If you do that and they're still hurting after several hours, then I would have them redo your prescription and check for convergence insufficiency (in which case you'd get a prism, as Mark said). I definitely would not wear them for a full week if you're having problems; that strikes me as very bad advice. You might want to consider going to a different optometrist, and maybe even an opthamologist.