I'm concerned i have mono?

i went to a concert last friday and shared cigarettes with 2 people and almost a week later my tonsils are swollen to the point of pain when i drink or eat anything (including water), my nose is stuffy and i have some sort of flem coming from my throat and mouth although i don't have a fever or any body pain. im not sure if its mono or if im just sick but i get the feeling its mono... please let me know your opinion