4 month old will not sleep up for 12 hours

[Hope2020]

My 4 month old has always been a poor sleeper due to reflux, but we're currently giving her omeprazole which seems to have curbed much of her reflux symptoms. However, she will not sleep unless I stay in the bedroom with her on the boob. Now she won't even stop crying when DH has her. She seems to already know what she's doing in being defiant though I can't believe that a 4 month old can do that. She has super long periods of awake time when she becomes overtired (usually wakes up 10 minutes after falling asleep and if I'm not there to immediately put her on the boob she wont resettle). I feel so trapped. She won't take a bottle, and if I don't settle her quick enough she becomes so overtired it results in these hours long battles of me trying to get her to sleep. I can't believe I'm being held ransom to my 4 month old. She doesn't like being held, she doesn't prefer being upright, she definitely won't sleep in her cot as soon as I put her in it she screams, white noise doesn't phase her, she cannot be rocked to sleep your arms will fall off before she closes her eyes, tried candles, pitch black room, hit and miss with the car and out in the pushchair. Please don't suggest the CIO method because trust me I'll be in tears more than her.

Any other suggestions please help. I honestly feel like a sleep expert wouldn't know what to do with her. I can't keep crying over this though...

but read recently the cheap ones from the supermarket sometimes work best, so will give those a go.

Absolutely! They're called cherry teat, they are more round and bulbous than other dummies. Tommee tipee do them

Are you breastfeeding OP? Sorry if you've already said. There's a fantastic FB group called breastfeeding with CMPA and other allergies which has been invaluable to me support wise. I really suggest you join it and ask there re confirming allergies and next steps if shes symptomatic still.

I'd also recommend Can I breastfeed in It, breastfeeding support group as well if you are BF

Lots of CMPA mammas there too and TT expertise too

Thank you all, thought I'd update you. It's been a tough few days. I realised that until her reflux is under control sleep expectations will just have to take a back seat. I just want to do whatever is necessary for her to be comfortable and to sleep regardless of a schedule. We have had a break through, for the first time she's taken a bottle (well only an ounce) and she's fallen asleep with a dummy. She has never done this before so I hope this means this tired mama can catch a break.

I have joined a few reflux, cmpa forums too.

Thank you for your help.