Shame, I can completely understand where you are at. It's so hard because as a mommy we just want to make them better. Reflux is a terrible thing especially when they are small.
My son had really severe reflux. He could never keep a feed down. Unfortunately we only picked it up at around 6-8 weeks and I got some wrong advice to stop breastfeeding (because people thought my let down reflex wasn't kicking in). I then put my son on reflux formulaes. I REALLY regret it to this day. Because it never made a difference really. The more I was trying to get him to drink from me the more he was fighting.
Anyway I realize now breast is best especially for reflux because breastmilk is absorbed easily and quick so it doesn't lie in the stomach to build up acid. Nexium works really well. Bearing in mind Losec and Nexium works differently. My son was so much easier when we started the nexium, he settled and the crying calmed down. Also what helped was to feed on demand and frequently. Obviously keep him upright after feeds. I would suggest a baby carrier if you can because your body heat will really help soothe.
The good news, they do grow out of it. Some kids just quicker than others. But I must warn though that when they get sick with flu etc... that the reflux gets worse. When you start solids later, it may help or may not. My son is now 13 months and still struggles at times. But we stopped the nexium at around 6months.
Sleeping arrangements- for us we tried letting him sleep in his own room because of how people put "pressure" on him needing his own space blah blah blah. It never worked for us, Michael used to choke when vomitting and we couldn't sleep with that thought. In the end I followed what worked for us, Michael slept by us and he slept so much better too nevermind us getting some sleep too LOL
Goodluck and just know it really will get better