Photograph everything before you open it. Ten seconds, settles most disputes.

Ask for the longer appointment slot. Ten minutes is not enough for a complex history and pretending otherwise wastes both your time.

Bring a list. Embarrassment makes everyone forget things, including you.

Same shape here, different drug. The thing that helped was documenting the refusal rather than re-arguing it. They refer rather than write.

Written confirmation email after every phone call. Cheapest insurance there is.