night three/four

Last night was a success...even though O cried, maybe not even less than the night before, he went to sleep on his own an hour earlier than the night before.  He wasn't in my arms, he wasn't nursing. He was playing and then just stopped and fell asleep. 
But, where we succeeded last night, was an epic fail tonight. I thought for one moment that he was going to fall asleep really quickly. He laid down and was quite still for a while, only 10 minutes after bedtime routine was done.  I thought - could this actually be happening?! I think this is it!!. He hadn't even cried at all. Sadly, this was only the beginning of the next 2.5 hour 'ride'.  Ugh. 
He played, he cried, then he played some more. And between those moments he bite me, probably a dozen times.  Something he has been doing a bit more since we started this process. Yes, he's teething, I gave him homeopathic teething drops, gel, and Tylenol to make sure he doesn't have pain from that while we're doing this damn sleep training, but I think these bites were out of frustration. And they hurt. A lot.  Babies teeth are sharp. And I'm only human. And I yelled at my little boy, more than once, to stop. This was after telling him no again and again and again. Some people say you should flick their cheek to get them to stop. I don't want to do that. But neither do I want to yell at him in frustration (or for any other reason).  I scared him. Some people say you should cry when you get bite. That didn't work either. Others say you should bite back. I did (more gently than he did to me). I don't think he got the message, but we'll see. He didn't bite me again tonight.  I lost my mind for a minute after he wouldn't stop crying and biting me - and although I very gladly didn't hurt O, I scared him because I screamed and starting crying because I had reached my limit. I scared my baby to the point that he did stop crying once I picked him up again, and just sobbed for a while. I feel like a failure. I feel like an awful mother for yelling. How could I scare him like that?! I'm supposed to be his protector from all things scary, I'm supposed to be his rock. Well, after sobbing (both of us) O fell asleep on my chest. Epic fail.