My 3 &1/2 month old daughter has bad reflux (also milk and soy protein sensitivity, but I don't think it's that) and she has been fighting me, arching and kicking me the last hour

She's crying, which makes the reflux worse. I don't know what to do! She's dead tired and is fighting that tooth and nail too. She's had her zantac, been fed, changed, gripe water pm, Tylenol a few hours ago. I'm outside crying and smoking cause I'm at a complete loss. My fiance rarely spends any time with her or me, but he finally walks in after I'm sure he listened on the monitor for half an hour, picks her up outta my arms, bounces and shh's her for 2min and then she freaking smiles at Him. My mom takes her and I'm sure my daughter automatically donked out cold cause I don't hear her..... WHAT IN THE ACTUAL FUCK?!! Like, wtf am I doing wrong?! We don't have her GI appointment until the 29th so they can see how fuckin serious this is after me telling them for 2 damn months and that I'm not just a frazzled overly sensitive new mom. She looks like something outta the exorcist when she arches her back so far and bad that its like she's gonna break her back, she moans and cries while doing it so I know she has no control. It's tearing me apart. This is night/day 5 straight of this. It starts around 8 to 9pm and goes until 6am or IF we're lucky enough for her to fall asleep deeply enough for it to subside a few hours. I have to cradle her all night every night because she forces her head so hard to the side that she'll sufficate in her basinet when she ends up against the edge from doing it. Just when I was starting to get a handle on co sleeping, This happens. I haven't slept more than 2hrs at a time, maybe 4hrs a day tops since she's been born and then diagnosed with reflux.

Help help help😭😭😭😭😭