I think my wife is trying to kill me - what should i do?

I cheated on my wife after 14 years of marriage and she went berserk. She's nutty as a fruitcake to begin with, but this unhinged her already unsound mind. The problem is that I love her so much, so I wanted to resolve our conflict. The night she found out I cheated on her, she whacked me up side the head and said, "You will wish I killed you quickly...but you sooooo desrve a slow painful death. She does not bluff, so I was near crapping my drawers at the time. Then we went to marriage counselling, and I thought we had it all worked out. She was even acting all sweet and loving. Then out of nowhere, I started feeling seriously fatigued and horribly nauseous. I surprised her last Saturday in the kitchen and caught her crushing up these white pills. They were her Vanadom pills which are muscle relaxants. She said she was crushing them because she was having a hard time swallowing them. Wrong! - Trust me, my wife can swallow near anything...I will leave it at that. Then I am drinking my orange juice and it tastes really bitter. I think she has been putting her muscle relaxants in my food - and who knows what else. I am so sick today. I have it coming out both ends. I can barely drag myself out of bed. That has never happened before. I love her so much but am a little scared. Am I being paranoid in thinking she is trying to do me in? Where should I go from here?