Hello. I Received Oral Sex From A Male (I Am

Hello. I received oral sex from a male (I am also a male in my 30s) I have a swollen testicle and a slight burning sensation when I pee and mild discomfort in my pubic region. I asked my doctor if I could get a STI from recieving oral sex and he said no it is not possible. I am going back in the morning but I wanted your opinion