Buffy poisoned in desert Spike helps her Illayria present

I remember reading a story wear Buffy was in some sort of desert dimension and was poisoned by a knife injury. Spike helps her heal but Illyria insists they keep going.

If anyone knows, please help!!!!

That sounds like it could be Marking Time by Night Owl Too?

It's on FFN - /s/2292652/1/Marking-Time

I think that might be it.

If it helps, I remember that Buffy was really delirious from it and Spike was trying to coax her to calm down or something and Illyria was all like "we have to keep going" and Spike's like "sod off!"

I found it! it's "All things that are lost" lady kate