Not Terrible 2's but Treacherous 3's

Lately I have noticed a change in Laci's behavior, it has be subtlety getting worse.  Laci has always been a very good little girl and I have never really had any problems with her behavior at all.  As I said I have noticed attitude changes building and recently they have exploded.   I don't know what happened all of a sudden but the sweet little Laci I once knew and loved has disappeared and been replaced with a not listening, back-talking, whining, tantrum throwing, limit pushing, screaming nightmare.  Laci will be 3 tomorrow and I can only hope that these behaviors will soon subside.  Along with all of this Laci is also having sleep issues.  Laci has always been an excellent sleeper but here lately she is up all during the night as well.  I believe that she is having bad dreams because she will wake up screaming or crying out, so I am up with her all during the night.  I miss the days when I would tell my daughter to do something and she would do what I asked,  because I asked her to, with no hesitation.  I was a pre-school / daycare teacher for many years and my favorite age to work with was the 3's class, in fact that is where most of my experience came from.  However the biggest difference is that up to this point, I have never had the parent point of view.  Laci has become a constant battle and it is very frustrating.  Oh did I mention the newest addition to the attitude, she has started wetting her pants.  We have had 3 accident's in the last two days and previous to now  I could not say when was the last time she had an accident in her pants.  The other day as I was helping Laci to get ready for bed, we were putting on her underpants, and she just starting urinating all over me and the floor.  I was quite dumbfounded at that moment as Laci has never done this before.  As the expression goes "It's better to be pissed off than pissed on" it's not always true.  At least when you are pissed off you know why!  All I have to say is that my patience are being put to the test and I am trying to be as rational as possible.  When Laci has an outburst or an undesirable action, I try to explain to her that what she is doing is not acceptable and explain why.  I believe for the most part that Laci understands what I am saying to her, I am not sure that she is in control of her actions before they happen.  We will keep our fingers crossed that all of this will pass quickly....Or daddy and I will be bald from pulling out our own hair.