Have they tried you on any anti-convulsant meds which, in low doses, may have the same neural effects? I take a low dose of carbemazepine, which really helps one of my headaches. (I get migraine and sinusitis, too).
Have they given you a diagnosis for your headaches? I'd be a bit reluctant to try botox until I knew what they were, or at least until they'd looked into it thoroughly. If you haven't seen a neurologist, I'd ask for a referral, if you have, I'd be guided by him/her.
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