Do i have a concussion?

In football the other day i ran into a kid full speed and hit him extremely hard. Because of this everything turned white then yellow and everything was a yellow haze then it faded off into a blue haze and i dont remember walking around the field. It took like a minute for this haze to go away and now 2 days later i feel like im out of breathe all the time and my head hurts whenever i shake it. My skull itself doesnt but my brain actually hurts when i shake it. i probably do have a concussion but i still felt the need to ask the question.