Ask HN: How to survive a horrible tech job while looking for a new one?

Currently, Im in a job that I really hate. There are countless demands on me, and the PM along with the CEO think everything can be done in about a weeks time and thats incredibly generous. I plan on learning my algorithms and data structures which are going to take me about 6 weeks since I've already taken a coursera course on them and want to really brush up. Im wondering how can I better manage the stress at work, and putting it with it when I know that in a few months Im going to be someplace else?