I have this on ocassion but usually accompanied with chest discomfort also. I take gaviscon and a warm glass of milk. I think somehow my reflux manifests on my back. but maybe can ask ur gynae to be safe!
I get this kind of pain sometimes especially when sleeping on side everyday (left side) For me it’s more of the upper left bone area aching. Usually last for a day
Glad to know that I’m not the only one facing this kind of problem! Hope it gets better for you!
Ilaria