Sick for along time! Help please!?

I have been sick for about 3 weeks now, it started out with Strep Throat, I finished the Meds then a few days after i went sledding with a friend, that night my throat hurt, a few days later it got better. about a week later i went Skiing and i now have a bad throat, I am congested and also have a cough, should i go to the doctor or just fight it out? Thank you for your help :)