Options for Sleeping with Pain?

Options for Sleeping with Pain? Every few months or so, I have plain flare ups in my shoulders and arms that are so severe that it causes insomnia that lasts for weeks because I’m in too much pain to lay down comfortably, specifically on my side. It feels like my arms and shoulders get to a place of pain that I’m not able to support my body’s weight when I lay down. Are there any types of pillows or supports - or even otc medicines - that help others with this? Thanks in advance :)