It sure is bad to have headache and nausea persisting for so long. You need to undergo evaluation by a neurologist
. He may order scan and some other hormonal tests like thyroid function tests
. The possible diagnoses which need to be considered are idiopathic intracranial hypertension
, cerebral venous sinus thrombosis
etc. It was good on your part to have stopped pills. Do not restart pills yet and get evaluation first.