Has anyone getting chemo been using Botox for Migraines?

I'm on taxotere, herceptin, and perjeta every 3 weeks. I've been on Botox injections for migraine headaches for almost a year now...just started chemo in August. Oncologist thought it would be ok to continue. Pain specialist who is in charge of migraine is supposed to be checking with manufacturer.  It has pretty much obliterated the migraines. I'm a little afraid to have the injections.  Chemo is enough to deal with and I don't want to cause any problems. But like I said, the Botox and oral meds have been completely successful. 

I'm hoping someone else on these boards has already faced and answered this question.

Thank you