Mine had silent reflux. He was a super happy contented baby in the day, and turned into a screaming ball of pain and anger at night!
Was a nightmare. Took ages to realise that in the day he spent most of the time being held upright by me, and slept either on me very upright again, or in the car seat which held his head way higher than his tummy. I tried all the usual suggestions, like putting blocks under one end of the cot to tilt it etc. But the only thing that helped was holding him upright and letting him sleep on me. Which meantime a nervous wreck of me due to sleep deprivation!
A super kind mumsnetter gave me her baby hammock, which helped him sleep a bit longer. I remember the celebration when he slept more than 20mins in a row! At 4 months he definitely got better, but that meant sleeping for 45 mins in a row, and easier to settle after waking. Honestly, I have no idea how I coped looking back!
But, DS was an extreme case, and I really wish I hadn’t been fobbed off as a stupid first time mum who was exaggerating, as I bloody wasn’t and clearly something was wrong.
So, all I can say is, try everything, because some of this stuff might work, but it’s hard to tell what will or won’t until you’ve given it a good go. And be persistent at the docs, and don’t let them fob you off!
Also read up on silent reflux, many gps only know about normal reflux.
Finally, you will get through it. It will stop and you will be able to function again. Don’t be brave, get anyone and everyone to help you. Try and get people to take the baby for a couple of hours and put your head down instantly... I made the mistake of not wanting to miss the good bit of being a mum (the day time), and I could have made things easier for myself by snatching sleep when people came over. Expressing will help with that if you can?