Neck and shoulder posture and pain?

[Ninja Kev]

Recently (saturday afternoon), I had a fall from my bike and flipped over the handlebars and landed straight on my back. From then onwards, I have a pain in my neck when I turn my head to the right and I noticed that my neck and shoulders were not in the correct posture. My neck tilts to the left and my right shoulder is lower than my left. I really want to sort this out now because I don't want it to affect me later in life. Thanks