I Slept Wrong About Three Weeks Ago And A Couple

I slept wrong about three weeks ago and a couple days later noticed a soft knot on the big muscle on the back right side of my neck....it's not sore no headaches been taking Advil and rubbing with the area down with alcohol. It's not gotten any bigger but it's still there should I be worried? Or does it take a while for knots Luke this to go down? Oh went to a family care office... Dr. said it felt like I strain my neck muscle. Your suggestion please.