Welcome to HCM
We understand your concerns
I went through your problem description. I suggest you not to worry too much into the symptoms. Most probably the pain has no pathological backing, that is your family physician negated it. The pain could be simple muscular cramp and due to the pain you panicked and resulted in light headedness, I suggest.
Second chance is stress
. People with anxiety disorder do experience pain around neck and shoulder. To make sure, do consult a psychologist
. I can help you through healthcaremagic if you desire so.
Hope this answers your query. Available for further clarifications.