Ah yes,......emotions in third tri!! Marvelous what hormones can do to you isn't it. Tomorrow is a new day hun, try to embrace these last few weeks where you can get up when you like, and sleep when you like.....trust me, those first few weeks with a new born have you begging for some quiet you time and a kip.
You are completely normal in feeling teary and down, you do get to the point where you get fed up with pregnancy too.....but I believe its so that you are mentally prepared to go through labour, I lost count of the amount of times, in that last fortnight especially, where I told everyone I spoke to that this baby had better come soon!! I was sooooo sick of being pregnant, that got me down.
All the waiting though, it is all forgotten once you are holding your bundle!!