I was working for the software giant based in Seattle. I experienced all the emotions mentioned in this post. Lucky that you had an option to take a break for 6 months. I cannot quit my job and take a big break as my visa does not permit this but I did quit my job and spent a month looking for another job which was even more stressful. Currently, I am lucky that I work for a company which truly values employees. I am currently recuperating and it is gonna take some time. The important learning is never to allow this in the first phase, when you have a inception of a thought that something is not going right, get on it and fix it and never ever think about it again.