I read your question carefully and I understand your concern. The fact that you feel the lumbar puncture helped you is interesting. It might indicate a condition called idiopathic intracranial hypertension, in which the migraines might be caused by raised intracranial pressure. However since you mention being admitted twice in the hospital it s less likely because chances are it would ve been noted, both on the examination of the eye fundi and on measuring lumbar puncture fluid pressure. However at times fluid pressure can fluctuate and result normal, so eye examination is recommended for the possibility of papilledema, swelling of the optic nerve papilla. If that is the case imaging with MRI including MRI venography and phase contrast. Of course if no such signs are found it might be a coincidence, and treatment for migraine will be instituted by the neurologist. I hope to have been of help.