Only sleeping on me

LO is 8 weeks old and tonight she’s only sleeping if she’s being held. It doesn’t matter how she’s held but she wakes up and starts crying if we set her down in the bassinet. Up until now she would sleep in it and the other night she slept for 5 hours straight after days of being up every hour.

I feel like I’m at a loss. I can’t cosleep because she has to sleep propped up due to reflux (pediatrician told us to, I know the risks but when I had her on her back she woke up gasping for air and I’d have to clear her airways so… no flat sleeping for her) and I don’t see how I could make it safe for her to be propped up next to me since that’s already not very safe.

We tried heating pad in the bassinet and having a heater on in case it’s too cold and that didn’t work. Just kind of at a loss, not being able to sleep all night because of holding her is going to catch up to me. I had my fiance take over for a little while so I got a few hours. She already only naps on me during the day so I can’t get sleep in 😵‍💫