Vibration in back upper lung left side after laying and taking deep breathe

Hey everyone !
I noticed early last year I began to get this slight vibration gurgle noise when I’d get up from laying on my back usually laying not all the way on my back but upright a bit and when I’d take a deep breathe. I was pregnant and it disappeared towards end of my pregnancy and now that I’ve delivered it’s back again and actually worse. I get back pain like feeling in my upper back when I move or try to stretch as well it’s like an irritation. I have twins so My back is always sore from picking up and leaning over feeding and changing diapers etc. Anyway I notice when I let a baby sleep on my chest and lay on my back I get it as well it’s like the pressure on my chest irritates or something so when I take a deep breathe I hear it. Usually goes away after one or two deep breathes. It scares the crap out of me. My doctors don’t know what it is but will send me for an X-ray to see if they can pick up on ahyhing.
Anyone had experience with this and any advice ? It’s making my anxiety really reallly bad considering I just had two babies and I’m always scared of what this means.
Thanks!

Anyone else have any experience ?