Hello lovey and welcome to BW!
Knowing he has reflux is a good place to start from - frequent wake ups and discomfort when lying down are typical of reflux babies. Is he on any medication for his reflux? You are likely to have difficulties with sleep until his reflux is under control and he is comfortable (which makes sense really). I'm afraid nothing is going to "work" if he's in pain.
Do you have a sling you can carry him in? That would be easier on your back and arms and you might get out and about a bit more.
We have a dedicated board for Colic and Reflux, you might like to look around there and maybe post on it. There are lots of experienced mamas on there who can help you through this.
Colic, Reflux, & CryingVery best of luck, and sleepy dust to LO!