pitmom, Many thanks for your suggestion, I visited another 2 neurologists and they suggested on me to wait for another week before doing anything because this horrible drug needs 2 to 3 weeks...
I visited a neurologist who diagnosed me with "tension headache" and prescribed me a cortisone injection in addition to 9 days of prednisolone (3 days 60mg, 3 days 40mg, 3 days 20mg) = total 10 days...