The sharp pain has resolved - the 1% I spoke of has all but disappeared... sometimes I 'think' I detect something, but it's so ridiculously minor, I can't even be sure!

I actually do have a tight middle back and neck (the neck tightness is what a layman such as myself would call 'upper traps' and 'low' neck, or something...) I am even experiencing this right now. Silly of me not to think to mention it....