remember that coding and solving problems in software engineering is not the same as answering tricky quizzes during technical interviews.
tell yourself that every failure helps you to improve and do better the next time
send an email to the company/interviewer if you can get feedback about the tech interview. some emails might go unanswered, in some you will get a very generic and politically correct reply ( which is basically useless) but in some cases, you might get some valuable info to let yourself learn from the experience.
try to go through all the questions and see if you can - in a more relaxed state and with the help of google - finally answer them properly
keep a "diary" of all the questions and periodically go through them. ( your skill will have grown over time and you will smile at the memory of how you struggled to answer some of them)
nice article.
Thanks for sharing, great advice. And also, awesome article about practicing for whiteboarding interviews. Definitely using some of your tips!