Cough medicine while breast feeding?

Ni

I called my Dr office to ask what I could take for allergies and cough, and got the answering machine. They never called me back. Called my son's pediatrician, but of course I'm not their patient so they couldn't tell me either.

Does anyone know for certain if this is safe while breastfeeding for baby and supply? Google says many kinds of delsym are safe, but I can't find anywhere which kinds 🤦‍♀️ if I cough all night I wont sleep and neither will my one month old