Hi. Welcome to JustAnswer. I am Dr Uzair.I am reviewing your post and will post back with your reply momentarily.
Since the pain is related to muscle movement and positional it is most like muscular and you should see a neurologist in this case.
Hope this helps.
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Since a good clinical examination can differentiate between muscular or organ pain, So according to the examination done by your GP you should see a gastroenterologist or medical specialist.
Thanks for the reply.
In that case it would be best to see gastroentrologist or medical specialist as he can address both type of pain either muscular or arising from internal organs.
This can be from spleen, or colon or pancrease so a thorough examination is needed.
Yes, You can do that.
He would like to have ultrasound so see him after getting ultrasound. He might order blood test liver function tests.