wouldn't cover his scrips or anything he ordered. If your in US it doesn't mater who the prescribing Dr is to fill the script through insurance. Do your own research and walk in and say you want x, y, and z @ x strength because your having issues with symptom a, b, and c or if he has any better ideas. You have to be that assertive and word it like that because you have 10 min. To make your case and for him to give you his opinion and script.

Make a list of medications you tried and why you don't like them so you don't have to repeat things that didn't work.