If Tylenol and Advil is not helping, it is likely not even teething! I have a 2 year old who is having teething trouble right now too...not as bad as you described, but still! I find my patience is a bit low for this as my own kids never seemed to have pain from teething. I do know that everyone feels pain differently and teething is worse for some kids than others, but I also feel like it often becomes an excuse for everything...when you don't know what to do, call it teething. I wouldn't be able to manage 9 hours of screaming for weeks on end!