Yes, I have a road bike (I guess I should've probably mentioned that earlier). I don't think it's due to my bars being too wide - I have a WSD bike that came with 38 cm bars that seems fit my shoulder width really well.

What is involved with a professional bike fitting? And how much does it cost? I think I might invest in that, not only for the neck/shoulder thing, but also for cleat placement. My toes went numb on yesterday's ride, and while that's happened before, and it was worse yesterday than before.