Crazy, the fact that you're both people who can sleep in the same position all night long is absolutely wild to me. Lol

Understandable that your am feels weird though, and will probably get worse over time. I've literally fucked up my shoulder so bad by sleeping on one side that I couldn't move it for a few days and had to go to urgent care over it.

I would look on Amazon or elsewhere under "cuddle pillow" and see if you can find something that fits with the way you guys sleep and can take some of the pressure off your arm. I'd also consider switching sides regularly.