To answer the question of how to recover from repeated interview rejections, find people that have the same or similar experiences which will help you recognize how capricious the hiring process is. My wife and I have both been recently turned down for positions, at different companies, after going through the full process and being told that we should expect an offer soon. We now laugh about it and expect to get turned down when all the stars are aligned. As a result, I only apply to positions where I am interested in talking with the people that work there so I at least get to enjoy that aspect.