it's always hard to share things like this with someone else, we are all here to listen and help anyway we can.
Could you take some immodium to help slow down your output, then maybe wean off the pain meds? Or try the bulk up diet, that is things like bananas, french fries marshmallows.
I dont' know where your stoma is placed, but i didnt' really have any problem with it as far as clothes are concerned, i bought a size larger in some things and wear longer shirts. I don't know where you are from, but in the southern US where i am, there is a store called Kohls, and they have a brand of jeans, sonoma, that fit kind of odd i buy them for my husband, and they ride low in the front but regular height in the back. Also, JCP has a brand, St John's Bay that in the womens at least (i think the mens would be the same) that streches really well, so it will fit no matter what.
I hope that helps some.