Can't cure vampirism: Falion won't interact

I am tired of being a vampire, so I'm trying to complete the Rising at Dawn quest. I've spoken to Falion initially, given him a filled black soul gem, and met him at dawn in the black swamp, but I can't Speak to Falion, which is the trigger for the ritual to actually cure me. He just stands there. (I've recently drunk blood – this is not about people attacking me.)

I can talk to him about other things, why he's in Morthal, etc, but I can't trigger the ritual.

Steam forum suggests this is a glitch and even has a fix, but that fix requires you to type a code in the console. I don't know how to do that in the PS3, if it's even possible.

I'm having a lot of trouble with the 75% fire weakness. How can I stop being a vampire?