Way Too Tired...

Any tips on how to not go crazy in the middle of the night while you let your baby cry it out instead of feeding him yet again? Keats was sleeping through the night but ever since our horrible cold, his teething, and now his growth spurt, he's waking up every hour to two hours absolutely screaming and louder than ever. In the midst of it, I'm tossing and turning and trying not to pull my hair out. It's so grating and sad... We need help. Please!