Jazzy, just a little added suggestion...
I'm glad to see that you have a neurologist involved in you're treatment, and understand that you are not pregnant at this time,...but you may want to see if your neurologist will have a phone discussion with your obstetrician to see if they can come to some agreement about the best treatment for your cervical pain. Balancing the benefit and risks of your medication/treatment might need to involve both your neurologist and obstetrician.
From what I have read, there should be no harmful effects of the Botox to you're unborn child, since it only affects the muscle at the site of injection. However, I also understand that is not really you're question, ...and that you are concerned about the neck pain.
I think I would visit with an OB, and see if there is really a need for you to quit the Botox treatment, especially if it is giving you some relief.
"Snowflakes are one of nature's most fragile things, but just look at what they can do when they stick together"