i got a friend with bipolar disorder type 2, and bulimia eating disorder.
i myself got anxiety and panic disorder.

she currently purging and abuse laxative, and cried everyday, i cant stand looking at her like that anymore.

1) she asked me to buy laxative for her, and flip out, angry at me when i refuse, am did i right thing? i was speechless when she angry, but actually, what should i say??
2) she ask me to buy some food a pizza to be precise, because she was hungry, what should i say, what type of food good for her? should i state the reason why i bought this and that?