That is a question for the Pharma companies, supply demand and greed.
All I can suggest and to talk to your doc and see what else can be perscribed.
I understand your frustration, I have been there twice. Try not to get anxious, stay as calm as possible, or you migraines will become worse.
Peace and strength
Moderator - Depression
"...when the gift of sight is cause enough for jubilation."
Billy Collins from the poem. HIGH
DX: reverse Trigeminal Neuralgia;Cluster headaches; Atypical face pain;Hemicrania Continua; Complex Migraines: raynauds;Complex PTSD; recurring MDD,disassociative disorder with psychotic features.