Ouch! I haven't, but I try to spread any slings more over my shoulder than my neck near my spine. Still, if the sling is comfy with weight distributed evenly, I'd say you're probably wearing it the right way anyway...I hope it's not caused by the sling and it something easily fixed.

As Suse says, if it is an issue, something like a Mei Tai shouldn't cause any problems, and are super comfy.

All the best at the docs. xo