A 32-year-old female presents with headaches. She has a severe | Neurology collections 2020

A 32-year-old female presents with headaches. She has a severe frontal and occipital headache which is
present as soon as she wakes in the mornings. She had given birth to a baby boy one month previously and
has not been feeling well since.
Examination revealed bilateral blurring of the optic discs with a pupil sparing third nerve palsy on the right.
What is the most likely diagnosis?