Michelle, it took mine a good 4 months to start up again. Not that I missed it! Then the hernia surgery I had, it stopped again! Just had it again last week of October.
As for bag changes, I dont always have a small in the day and large at night. Sometimes I'm just too lazy. I leave it midi sized day and night. I have noticed however, the longer after the op, the less output I have. (well, I'm flaring again now so the output is worse) I'm on a normal size bag for last two days for instance. I really just like the option of being able to quickly change. Bear in mind I work with the General public normally, so I have to be quick. No nice toilets and breaks. So, small during the day and bigger at night suits me.
As for the pfffffftt. I can 'feel' the pffffffffft, but I dont think anyone can hear it. At least, they dont admit to it!!! :confused2: