Advice on Reflux please!

Inese
Hi. Any other parents have baby with reflux ? My daughter is 3 weeks old and she won't sleep on her back , we spoke about that with nurse and she said it might be because of reflux as her stomach acids comes to her mouth when she's flat and then it looks like she makes face expression like ate something nasty . Nurse said to keep an eye on symptoms because sometimes it's not so obvious at this early stages and last night she vomited all milk out and keep waking up and pulling her face so I guess she have reflux. 😱 we try to keep her upright as much as we can . Maybe someone have other advice how to make it easier for her . Thak you 😚