Hi Collegegirl,
Welcome to the Pain Mangement Forum. I am sorry that this happened. I will not question why but offer that it is difficult to accidentally overdose on Tylenol PM. I urge you to consult a therapist or a similar person. Many of us get upset too but we don't respond in the way that you did. I am concerned for you. Please talk to someone.
You will know if you have done any damage by the test results or pain in your liver area or lower back. I suggest you also get a follow up blood test in about a week or two. Although what you did was very dangerous to your organs it is not common that a one time incident will destroy your liver or kidneys. It does happen, don't get me wrong but the odds are with you. Continue to drink plenty of water. Don't add any liver or kidney stressing chemicals to your system for a few weeks, that includes alcohol.
I think you will be fine but please keep us posted. We will look forward to your updates with interest.
Good Luck to You,
Tuck
Why do you think you OD'd?