how to ask for immunization records from my pediatrician office

i have severe social anxiety. i turned 18 so my mom cannot do it for me now. i need to obtain them today in order for my to do this orientation program. the issue is i am afraid of calling because I do not know what to say and I am afraid that my former doctor will answer. the last time i had an appointment, which was when i was 17, she and my mom go into a verbal argument and it was very embarrassing for me. any tips or advice would be much appreciated.