I've fallen into this trap myself and understand where you are coming from. You get so burnt out on your current job that you start to treat every job interview as a potential relief from this burden in your life. What happens though is that you start to sound desperate when interviewing. No one wants to hire a desperate person. Even if you are the most qualified candidate, if you give off the wrong vibe it is difficult to get hired.

My advice is to stop focusing on the outcome of interviews and just focus on what you can control in the process. Try to do a few things each week that will make you seem like a better candidate than you were last week. Treat it like a game where you are leveling up during each round. Go back and review interview questions that you didn't answer well and rehearse what you would say the next time. Put together some material that you can show to someone interviewing you that helps guide the conversation towards your strong points. Keep an open mind and talk to people in your industry. Making it trough several rounds with Google means you are a strong candidate. If you keep up with the process, you'll start getting job offers.