Welcome to the "Club" dude, but you neewd to know that there is a big difference between the docs recommendation which you got yourself and a state ID "Card" for medical use.

A state card provides surefire protection from local and state LEO, as it is a state issued card like a DL.

A docs recommendation still makes you legal to purchase and posses weed, except you must be xtra careful as there is alot of confusion w/ fakes, night time encounters w/ the cops and no doc to get ahold of etc.