Yes, shoulder pain can be related to gallstones.
I don't think neck pain is really related to gallstones. That may be due to tight muscles in your neck.
should get checked out-might be rotator cuff or pinched nerve in your neck
or a combo. i had similar and they found herniated disk @c5 and
torn rotator cuff. gfo to primary and see if need referral to a GOOD (i cannot
stress that enough-it took a year before i found my good doc) ortho. if
that's what they find, of course!! be well and best luck!!