I have done Botox for migraines/chronic headaches. After over a year and a half of them I finally did it.

I had done chiro, massage, physio, personal trainer, anti-seizure meds, advil, antidepressants (elavil) and more.

My neuro and another doctor suggested it (occipital neuralgia - which can be like migraines).

I had the injections in my forehead, skull and all down my neck on both sides. After about a week, I noticed the level of headache reducing. After about 6-8 weeks, I have noticed them coming back stronger, and more pain in my eye (nerve) from light/movement.

My neuro said it is cumulative so may need a few rounds. Chronic muscle spasm and tension, sitting upright (I have a rib/shoulder injury as well) and stress just make them worse.

I was really nervous to do this, and after I got used to not being able to really control my neck it hasn't been a big issue.
I am now looking forward to my next round as it is supposed to last longer.

Hope that helps.