I am so sorry for all you have been through the past days. Absolutely you had a right to fear for your dog's life but look how well you handled it. My dog is my best friend and the thought of ever losing him I keep out of my mind as this dog is the greats therapy dog and I need a lot of therapy these days.
Trust poison control. AS a nurse working 26 years in an ER I know Poison Control is one special service. WE would call them to report an overdose and they would always have the info right at their fingertips. Also they would call back later to ask about the patient and how they were doing.
I am not going to post the max amount of Tylenol in your thread as someone may read it and know how much to take intentionally.
When your dog was in crisis your body most likely responded by flipping into the fight or flight response by producing stress-related hormones and adding them with high pressure to our blood stream, sending them to every muscle with high-speed in order to enable us to react in a very short time and to mobilize all the reserves we have.
Once the crisis situation is under control most of us "crash" or feel overwhelmed with fatigue because our body is return to it's normal state.
I would ask you, for now, to just cuddle your pet and take care of your family and yourself. You don't need anxiety hanging around whispering in your ear, " Dr. Google's office is open 24/7. Kick you anxiety to the curb and do your best to stay in the moment.
Hugs,
Kitt