I agree with MadB about the hammock. It's adjustable so he can be tilted so his torso is higher than his feet to help with the reflux. I found having the amby right next to me was fab cause. Could rock it with 1 finger in my half sleep so she'd resettle.
Also perhaps something like the Love to Dream swaddle me up sleeping bags would be good. DD would suck her fingers through it but couldn't cover her face with it.