I get the same with hiccups (not the vomiting tho ). I've found he'll still drink when hiccuping - and I remember a middie at the hossie saying that some babies will & some won't. So saying, he will lie in his bassinet & hiccup away without being too bothered by it.

The only other things I tried (which you've probably done) was changing his position - as that could disrupt the hiccups mebbe? Good luck with it!