Hi Fire,
Does he have a dummy? you may find that will help him settle too (BJ has one, but he pretty much only has it at sleep time).
Try searching for anti-roll pillow there are a few different styles (we have 3 different ones that were given to us from various people!).
If you don't get too many show up, try just searching for pillow in the "baby" category.
If you want any help let me know (Im a bit of an ebay junkie!), just drop me a pm, or email me
shelley@lurgen.com

On a personal note for us:
We have removed Zantac from the mix completely. He'd had a dose about 4am yesterday and then I think we accidently skipped one, he's had a really good day, then when he had his dose at about 6pm, and it all went to crap, the crampy look, the crying, the not sleeping, the straining.
On much deeper investigation, hundreds and hundreds of people report the same reactions from their kids, and then have shifted to I think its losec?.
We are going to the Chiropractor this arvo to have him adjusted (chiros can work wonders for reflux apparently), and the Paed on thursday.
We are keeping him off the Zantac til thursday to see how he goes.
I think the lower does moves through his system faster though, because at midnight he went to sleep and slept right through til 6, I put his dummy in, he went back to sleep til 7:30, had a feed, was back asleep at 8:15, and now, at nearly 11am, he's still asleep!
Will have to see how the rest of the day goes!