A week ago I increased from 150mg to 225mg. At first I felt very jittery and anxious but that seems to have passed and since yesterday I've had an awful*headache!*Painkillers*don't really do much, the only thing that seems to relieve it is laying down and relaxing/sleeping. Has anyone else had this issue and how long did it last? I don't remember having headaches like this on previous increases*