You are not the asshole. Teething toddlers are not an easy thing to handle as at times nothing seems to help them. Its not malicious on your part or your childs so keep doing what youre doing and it will pass. Fuck all the people saying you should overdose your child medicine or to go to a doctor because your child is crying. Toddlers cry anytime they want especially when they are in pain. Keep your head up and love your child.