i recently had a bad dose akin to your symtoms and this started on a saturday so obviously no docs.
so, i rang nhs direct and spoke as it turned out with one of these super type and very good nurses.
she asked all the right questions,symptoms and medication etc.
her answer was to only drink fluids for a couple of days and to take 2x4 paracetamols daily and said it should clear up which it did.
if you have had this for 6 weeks then this is serious as normally your immune system would kick in . you must if still poorly see a doctor. get well soon.