question about evaluations

hello, for those that have now met me yet, i am a patient living in southern california....with a question. I am schedule to go meet with a doctor at ACC in the coming weeks...Originally when i met with them my first 2 times in...i had presricptions from a doctor for medicines that are used in controlling migraine headaches.....lately i do not use those medicines anymore, thankfully.....i choose to use marijuana now....anyway, i want to know if i really need to go see a doctor not associated with ACC first to get a script that i don't want to fill anymore...or if i can just go to my Doctor at ACC and talk through it with him and still be able to have him give me a recommendation. any help is appreciated.