How do I deal with my stressed out, perfectionist boss??

Start off by taking a deep, relaxing breath, and then recognize that with perfectionists, it's often impossible to please them completely. The best thing you can do is head them off at the p, and try to eliminate as many of HIS stressors (small mistakes like typos, etc). If he's less stressed, that gets ped along to you as less stress. I having a sneaking suspicion he "knows" he's a difficult boss, hence your 40% raise upon starting there- he might feel the need to entice people to work for him and he felt you were a good fit. It's hard to develop a thick skin, but your time there is relatively short, so given time, ideally you'll be able to learn to live with his quirks and not take them personally.