I understand you perfectly. I too have been ready to throw the towel in a few times and have only been charting my cycles for two months now. I've gone through the reading every sign and symptom to watching my temps like a hawk and wondering what the devil is going on.
I've gone through the stress of timing BD and feeling like the 'fun' has been taken out of it from time to time. I've got myself stressed and tearful and moped around the house feeling like I just can't be bothered any more. I've had all these emotions and experienced them ALL in the space of a day. So, honestly you really are not alone as we are only a few of millions who feel exactly the same way. It's natural to feel this way because we have such little control over what happens and when. All we can do is our best and nothing more.
So, the moral of the story is ... go ahead and rant and throw your teddies out of your cot. Go ahead and tell yourself that you're going to give up. It will help you dispel some of the frustrations that builds up around ttc time. Then, when you've had a good cry and got it out of your system, try to occupy your time with other things for a week or so and you will soon find that you are ready to try again. A little break does everyone the world of good and gives you strength to start anew.
You're little miracle is just around the corner. I can't tell you which corner, but it won't happen if you don't try. You just need to make sure you are relaxed and ready to enjoy trying. I wish you peace of mind and an extra sprinkle of

for when you are ready.
