has shoulder bursitis been ruled out? I have copied and pasted some information on this below. If it is shoulder related (and you have "transferred" pain), the fact you put "pressure" on it at night from lying down could explain why your pain increases at night.
"The Causes of Shoulder Pain Defined
Bursitis is inflammation of a bursa. A bursa is a tiny flu
id-filled sac that functions as a gliding surface to reduce friction between tissues of the body.