What's the best way for me to go about getting Botox treatment for intermittent upper eyelid retraction?

I have intermittent upper eyelid retraction(my upper eyelid retract making my eyes open wide. Giving a scary or crazy look. it happen randomly or when i get anxiety) and have been to doctors but I'm having trouble finding a doctor that has the knowledge on how to treat it, or giving a diagnosis. some doctor would refer me to another doctor to get other things check, like my thyroid, but because no insurance and time I'm look for botox first. What is the best way for me to go about getting botox?