关于胃痛要请假的英语作文

Dear Mr./Mrs. XXX, this is XX. I'm writing to you because I need ask for one day off. I have stomachache. My mom took me to doctor this morning. The doctor gave me some medication and asked me to stay at home for one day. The attached is the diagnosis from the doctor and the sick leave certificate, please have a look. If there's any handout or assignment, could you please keep for me, I will collect from you when I'm back to school.
Sincerely,
XXX

胃癌