I'm pretty new to biking, so I have a very general question about form/fitting. I ride about 140 miles a week and every time I hit the 10 mile point on my rides, my neck really starts to hurt. At first I though my form was too aggressive, but even after adjusting that, it still hurts. It feels like I have to crane my neck up too much, but when i asked a friend he said my stance wasn't that aggressive and my neck shouldn't be hurting that much. The best relief for my neck it to touch my chin to my chest, which hurts a bit, but stretches it out the other way and helps with the pain. Once I get to the 30-40 mile range, it can hurt so bad I have to stop.
Here's a photo of my setup. I moved my handlebars up the extra notch on the stem so they're higher and leveled the seat, but it hasn't helped that much: http://i.imgur.com/i1PWf.jpg?1
*I also put a front brake on the bike
Also, after switching to clipless pedals (still confused why they're called that), I've been experiencing some lower back pain. I'm guessing that's just because I'm working new muscles while pulling up, because it's very prominent on hilly rides. I fractured a couple vertebrae snowboarding about seven years ago and I've had problems with my lower back ever since, so I'm sure that plays a part as well.
Between the two problems, it can really sap the enjoyment out of the second half of my ride. Any form suggestions (sorry I don't have a picture of me riding)? Or more of a physical therapy type of thing?