No, I've not talked sludge or transmission fluid details yet but I will go to the dealer again today and take what I have learned from this forum. If there was a rotten egg smell, it would have been overtaken by the smells of all of the hydrocarbons and non-burned stuff that I was smelling and being affected by.
Besides them disavowing the existence of a problem, I realized when I started to learn about problem that it is carbon monoxide that makes not fixing it truly dangerous if some exhaust is entering the cabin of the vehicle. Interestingly enough, ever since I got this car, I would tell friends how difficult it was for me to drive long distances because I couldn't stay awake - which is really strange since I suffer from insomnia. Realizing that maybe the carbon monoxide might be the culprit to my driving sleepyness strikes me as something that Lexus shouldn't ignore. Except they will want to disavow anything if this the case.