I certainly sympathize and empathize. RCR is very painful. I found these to be the most helpful: Wearing a cryo shoulder ice cuff (A LOT); using an adjustable bed --this enabled me to sleep, as the exact angle of elevation I needed changed frequently during the recovery; rolling/folding a towel and placing it in the bed under the elbow in the sling; placing something thin between your upper body and the upper arm (washcloth? gauzepad? my nurse got me boxes of 4x6+ gauzepads/non-adhesive bandages with a very comfortable nonstick layer over them); wearing very loose clothes (beach dresses and tank tops with huge armholes) that didn't touch the shoulder or sling at all.
RCR has a daunting recovery, in my opinion, but at least for me, once the
repair and reattachment healed/took hold, the pain ended. So
be careful and patient.
Best wishes.