Everything is making sense now, with the death scene, and why she is so shaken.
I haven't translated it yet, but I have read the page before it. She basically keeps noticing how Tidus is acting childish, and it she says, it is only natural since "Time stopped for him".
She then goes on to say "However, we can get through it. I still want to be with him forever, and I am sure in time we will get used to eachother. I knew it ever since our first kiss".
Then cue head blown off...
She then has a talk with a mysterious voice who claims to be an "existence like God". This voice tells her to remember Tidus, and to remember how much she loved him, how she fell in love with him, and the sadness she felt when she couldn't be with him forever.
She does all that, and then the voice says "I'm not going to erase your memories, just lock them away. Although they can come gushing forth if there is a certain trigger".
Yuna then wakes up in a room with Tidus, and he's perfectly fine, just worrying about her.