Are my eyes effecting the way i experiance my xbox 360?

So on my birthday (september 17) got a brand new XBox 360 along with Skate 2, NBA Live 10, and Grand Theft Auto 4. But I have a little problem: When i watch it my eyes make it seem like im not seeing what i could be. Its kinda hard to explain. My eyes just get kinda fuzzy, and when i look away from the tv or walk away everything gets all distorted and dark, and then after about 3 seconds its back to normal. Now a thing that might be my problem is that i have a huge tv. its around 5 feet tall and almost 4 or 5 feet wide. and our couch is about 4 or 5 feet away from the tv. so maybe if i scooted back or somthing then it would look and be better. Becuase I have more fun watching videos of these games on youtube, than playing it on my tv, because the youtube videos are usually small. So i want to know what could be wrong with this, and how to fix it so i can get the best Xbox 360 experirence. thanks