You think your wife is poisoning you what do you do?

Immediately drive to the hardware store and grab 20-30 paint swatches and a binder with couch/curtain textile samples. Leave them on her desk with a note saying something like "Picked up some initial paint and material samples. The only way the room will get remodeled is with a thought out plan. The creative parts are up to you but perhaps these items can get you started. I've also arranged for a 4-hour spa day on the day of the painting so you don't have to breathe in the fumes. Should be done in 10 days tops." This obviously buys you at least 10 days to determine whether and where the poison is coming from. She's likely to stop the process and that too will allow your body time to reject the toxins and get you to a level place within the ten days. Only downside/risk is that she hates the colors or you fail to deliver. No real downside though perhaps since she's already offing you. Ultimately, will be a nice last gesture on your part she can eulogize at the ceremony and enable her to claim the insurance proceeds without raising any questions.