I liked my job, I liked improving my skills in the past. I had really fun during a fishing, learning new language and running. These days I feel like there is no pleasure any more during any activities. I feel down, nothing makes sense and has worth. I cannot put effort in anything now. This awareness has came without any reason and it is growing, I'm feeling down and cannot break free.What should I do? Why it happened although I have fiancée, good money, nice flat and car? Is it burn out or something?