Worried. Help?

So my baby is 6 weeks old and when she is sleeping she stops breathing for maybe 20-30 seconds​ then catches her breath and it really freaks me out. I think she is going to stop breathing one night, that's how bad it is. So I called her pediatrician and asked if I should be worried and all she said was that she thinks it's acid reflux and to get her nasal saline spray.... But to me, it sounds more serious than that but idk.. Has anyone else had the same type of thing happen to your baby? I'm just really scared and don't know what to do. The spray doesn't seem to be helping either...