So where does House go? Stewart's place, which was not one of Wilson's options. Cameron asks him why he's here. "I missed you," he says, before ordering her to give Stewart another endoscopy (the first one was inconclusive. So much for the wheat test being accurate). But when Cameron tries to prepare for it, Stewart's vitals crash, much to House's joy. Instead of taking measures to bring Stewart back, House calls the lawyer for permission to admit Stewart to PPTH. He gets it and orders Cameron to do CPR while he calls for an ambulance. Cameron doesn't listen to him, though, and whips out the defibrillator paddles. The shock brings Stewart back, which is exactly what House was trying to avoid. With Stewart out of danger, House is no longer allowed to bring him to PPTH. Which means that Cameron put Stewart through all the pain of wheat force-feeding for no reason. Either commit to making the guy so sick that he has to go to PPTH or commit to saving his life in his home, Cameron. But you can't do both.
After the break, Foreman exposits that Stewart's heart rate is bradycardic, so Taub has put in a temporary pacemaker. House offers Cameron her job back so that he can fire her. Cameron defends herself by saying that her ER skillz say that you resuscitate a dying patient, so she did. I'm pretty sure they do CPR in ERs too, Cameron. House thinks Stewart is being poisoned somehow. Kumar points out that there were rose petals in the hallway when Stewart was found the first time, but Foreman says Stewart would have to eat a lot of roses to suffer from organophosphate poisoning. Hadley points out that the place is kept spic and span, almost to an OCD degree, which House finds interesting.
He barges into Stewart's room and asks him how often he washes his bathtub. "Every couple days," Stewart says. And he uses bleach and ammonia to do it, too, even though I'm pretty sure everyone in the world knows to never, ever, ever combine the two. House returns to the living room and informs the crew that Stewart has been unknowingly exposing himself to chlorine gas, which is fat soluble. That means that as Stewart's stomach pains caused him to lose weight, he became sicker and sicker. Um ... how did he not realize he was exposing himself to chlorine gas in the first place? Doesn't it smell? Doesn't it make you feel sick? Shouldn't Stewart have lung problems, too? House tells the Cottages to put Stewart on steroids and sodium bicarbonate, but Taub points out that the temporary pacemaker is temporary, and won't hold up forever. Taub can't put a real one in, and Stewart won't leave his home to get one from Chase, the only surgeon in the world.