Brain stroke. Should we change doctor?

There was extreme unbearable headache(dr say its brain stroke) after every 2hr. Doctor gave medicine (dolonex, stat ) by which stokes were reduced within a week. Now no stoke has occured for month, but there is continuous mild to low headache every time. Headache increases with talking, noise(sound). Much weakness is felt all day and sleeplessness at night. Headache is such that it pains even when head is touched or say while she comb hairs. [-No MRI or CT scan done yetas doctor told us that tests are not needed. -She was diagnosed Dengu positive just a 2 week before strokes & was not yet cured fully. -She also had migraine problem few year back. -Her BP always remains at lower end. - She was under stress and tension just before strokes occurred ] Doctor says it is migrain & will be OK, just take medicine, But continuous headache is there for over 1 month! Plz guide what this condition is ? Are we taking right medicine(as written in MEDICATION field) or should we change doctor?