Labor is not a creshendo with "." this much pain at 1cm and '<' this much pain at 10cm. It is a cycle/circle. Seven cm's is as hard as it gets, and after that it's just more of the same with blessed lovely breaks in between. You can do/withstand ANYTHING for two minutes at a time.
When you have the thought "I CANT DO THIS ANY MORE!!!!!!!" then you'll remember that the crazy midwife from that blog said that you're ALMOST DONE! When a lady says she can't take any more, I go pee really quickly because it will be my last chance before the baby is born!!
You can do it! You come from a long line of women who have given birth, and you were born to do it, too.