I had a very bad experience with Botox. I would urge others to beware and watch closely for cognitive impairment as a side effect.
LilbitTn, your situation sounds horrible. I can't imagine... and I have had frequent episodic migraines for at least 45 years.
My personal experience with Botox was that it initially helped after about 6 months (similar to you) but after that, I gradually developed symptoms that were almost identical to the list of symptoms attributed to Alzheimer's Disease. I had ALL of those symptoms that gradually developed between about 6 months and 18 months after beginning Botox therapy. Fortunately, all of those symptoms seem to have gradually reversed commencing about 6 months after treatment discontinuation. My Doc still claims that there is no documentation of any connection between my described symptoms and Botox side effects. I think that his claim is a logical error and an artifact resulting from the investigation and reporting methods used by the pharma industry: #1 Denial #2 Gaslighting #3 Failure to report all side effect complaints, or to investigate them with due diligence #4 Washout of study participants who show certain symptoms which the study sponsors wish to conceal or minimize #6 Failure to provide a mechanism for patient complaints after approval of a newly approved therapy #6 Failure to execute adequate long-term followup for RCTs on the order of at least 6 months to 2 years. I no longer trust "Big Pharma" at all.
For anyone considering Botox treatment, look at the list of AD symptoms and watch for any cognitive changes in your own situation. Also, to the greatest extent possible, ask several trusted people with whom you are in daily contact and also (this is important) some trusted friends with whom you have only occasional contact, to watch for cognitive or mood changes that might show up in your behavior over time, recognizing that the changes may be very slow onset.