Me, too with oversupply and related issues!
We took to posture feeding, as well as constant sling wearing - keeping him upright, especially after feeds and to get him to sleep, was critical and is probably why the situation didn't escalate in terms of my sanity.
I definitely found the co-sleeping, sling-wearing, demand-feeding, posture-feeding and some foremilk expressing helped alleviate a gut full of my milk from one boob!n It meant that whilst he was very gassy and burpy (and a little chucky when burping), he was not a very 'cry-y' baby. Sometimes he'd cry from it, but it was quickly settled by being thrown into the HAB It took well over 4 months for my supply to settle, and even now it doesn't take much for it to be thrown out of whack again (thinking of DS's present cold and frequent feeding...I'll go back to hard boobs again when he gets better and feeds less...check ticker for his age!)