Suggest Treatment For Persistent Cluster Headaches

Please help,I has a Cervical fusion about 2 years ago,Well the surgery was not succesful and while i was being treated i was having cluster headaches and he requested an Mri of the Brain finding a cyst on my brain that needed checking every year,now i believe my doctor was Awesome but lets face it the surgery failed and he has the best side manors,and here is where it all gets crazy,i was in alot of pain after the surgery still numb and im worst,now im having loss of memory which is scaring me to such anxiety in it self,well his assittant Christie after the surgery was making it so hard for me to make follow up appointments,she and Doctors surgery assittant would call my home phone to hit me off and tell me i could not come in because i was in so much pain,so come to find out they have blocked our phone numbers (christie the nursing asst,and how do i know this because i have a new cell ohone called Doctors office and it went straight through,So i went under my login that gives me surgery dates and because i missed an appointment back in march they ran 18 office visits this year and i have not seen this Doctor in pobaly 2 years,can you please help,Since then im schedued to see another Nuero.Doctor and have the brain scan done