It's 3 am and I'm up again

Can't sleep once again. Too many thoughts running through my head. I thought maybe tonight/this morning I'd try to get some out here. Maybe that would help.
Basically, things at work have been stressing me out. I try very hard to do a good job. Yet, lately there have been some things going on that have been causing me additional stress and losing sleep. Then I get upset that I can't sleep and frustrated that I am going to be exhausted the next day and unable to effectively deal with all these additional stresses. When I am tired and stressed I get more emotional about things which I hate about myself because it is so non-productive and I have too many things I need to accomplish.
Meanwhile I lie awake at night thinking (after I have checked my work e-mail, again)- How did I get to this point? Why am I doing this to myself? Did I make bad life choices and now I am stuck with the consequences? Why is my job so hard? Am I making my job too hard? Is it because I don't have the talent for this kind of job? Why did I pick this career if I don't have the talent succeed? Is it because I have to do things the hard way? Why must I do things the hard way?Am I making this harder than it is because I have to do things the hard way or is it because I just do not have talent to do my job effectively? Why am I kidding myself with this career choice if I am not cut out for it to begin with? Did I mislead myself thinking all these years that work needs to be hard because it is called work? Did I erroneously think that all these years of sacrifice and dedication would somewhat be rewarded as I slowly climb the rungs of the ladder? What if there is no real reward for the hard work? What if I just fall off the ladder because I was never meant to be on it in the first place because I can't seem to handle it and that I am kidding myself because I am not really working that hard and I should be even more dedicated if I want to succeed? What is the definition of success for me? Is it even attainable given the unpredictability of the future? Why am I getting upset over all this it is only a job after all? Why can't I be a Real Housewife of San Diego?