Mono!!!!!

Okay so I went to a party a week ago and drank out of bottles just like everybody else there. My friend and I both got a cold a few days after. I went to the doctors as well as her. She said she has strep. And my doctor told me I have mono. The doctor didn't ask me for my symptoms or anything when he walked into the room. I wasn't tested and I'm freaking out. I feel that he just said it to say it. What do I do?