Help!

[n8chergirl]

Hi there everyone,
I am a new cyclist. I have only been cycling for about 9 months and 4 of those months out was not cycling because I fell of my bike and broke a rib. It took FOREVER to heal! Anyway, I am cycling for the Team in Training to raise money for the Leukemia and Lymphoma Society and signed up for the Tour de Tucson century. I have been fitted by a professional to make sure my bike fits and it does. However, I am having MAJOR neck pain!! After about 25 miles my neck starts to burn and try to relax and stretch during the ride. I know my posture isn't the greatest. Does anyone have any suggestions for me? I am in good shape, but the neck issue may prevent me from finishing the race Thanks for your help!!
Anna ps...I cycled 51 miles this morning and couldn't raise my neck after 40...luckily, I didn't run into anything!!!