Can you pass STD's by oral sex?

I am a straight guy who thinks I have caugh a sexual transmitted infection, it is burning when I pee, I have a doctors apointment tomorrow, anyway my friend and I both got oral sex of off the same girl on the same night. We both didn't have sex with her. My friend his scared he has caught what ever I have as he has a girlfriend. Do you know what I might have from symptom described? and is it possible to pass on any infections to my friend from getting oral sex from the same girl? please help so worried.
 
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