Noob questions

im useing basic macro,

/cast Flash heal
/cast prayer of mending

it freezing up on me,

I am also useinf same macro with binding heal.

I use the fangs mana trinket so idealy i would like this macro to work

/cast flash heal
/cast prayer of mending
/use 14

Any ideas why its freexzing up on me?

You are using multiple GCD abilities. Cant do this in a basic macro you need to either use GSE or change your macro.