I do agree that stress can cause or aggravate headaches. Although my experience with Botox has been generally positive over the last several months, I recently had headache issues when at a family event away from home and out of my routine.
I cannot rule out stress and worry about feeling bad during the time away as the cause of a persistent headache for 3 days that faded in and out and was mitigated only with imitrex and gel packs on my head and coffee.
I very much believe that stress in migraines is a factor but also strongly believe that migraines are very real physiological events that are not easily understood unless you have them.
Migraineurs must become very very aware of the slightest sign of a headache to try to intervene because it can so rapidly become so much worse. When you are in this state - especially out of your own environment - it is not a normal way to function.

My migraines are from the cervical spine. I also have cervical vertigo causing blurred vision, nausea, migraines and sweating. 3 fusions, pain stimulator implant bilateral C34, C45,C56 yet still issues. Tried ablations, epiderals, Occipital trigger point with nothing helping. If I could not use my neck, maybe it would be better but that's impossible. Mayo or Cleveland clinic refuse to help me.