Yesterday, 03:04 PM
I had clicking with my first starting at 6 weeks and was told it was related to the OS. The laid back, or biological, position helped us a lot, and side-lying position allowed DD to just let "excess" milk flow out of her mouth, onto a towel beneath her, but you say you've tried all the positions.
For trhe reflux, which now my second has much worse than my first, i do find that the advice to hold baby upright after feedings, is helpful, not just with getting the burps out, but with avoiding the spit up/vomit. Personally, I find holding him against my chest, so that he is really on his tummy, at an angle, is the best for this. During that day, that might mean babywearing. At night, it's the same as the laid back position, only I hold him higher on my chest than if he was nursing.
I also use a pacifier if he gets into that vicious cycle of nurse, fall asleep, spit up, wake up from discomfort, nurse again to fall back asleep, hey look, that makes me spit up and wake up again! I am careful not to replace comfort nursing or feeding with the paci, I always remove the paci when the job is done (he falls asleep), and my son nurses A LOT so I think i'm ok for supply issues!