I'm still really loving this story!
I'm with tvnerdgirl, I've always really loved Lex. He's a very intriguing supervillain. And I do believe that he really loved Lois and would do... well, a great deal for her. I'm not surprised that he would try to help during her last hours, although one must consider that it's beneficial to him. If she dies, the obituary/article on it will probably mention Lex Luther doing everything in his power to save her. If she lives, maybe she'll be grateful enough to date him, or at least think well of him. And even if he was responsible for the injection (which I'm thinking less and less likely as we read on), he can make them think he's doing useful stuff while really keeping them from finding answers. Good deal for him.
I agree that Lois just needs to keep having fainting fits so that she can get carried about by Clark all day. But, I suppose she does have more important things to do.
Now let's get some investigating done! I'm really curious what poison this will end up being.
