Stridor baby

Has anyone dealt with a baby who has stridor? I'm a ftm and have a squeaky baby. When I asked about it, the doc quickly brushed me off with a diagnosis of mild stridor.

This condition causes her to get very uncomfortable when laying flat on her back. She snores, breathes loud, and sometimes sounds like she can't catch her breath. We've had to sleep her in her swings(4moms) with slight incline, which our doctor approved(interestingly enough). Doc said she will grow out of it, but my anxiety sky rockets because of it.

Anyone deal with this? How?