WAS IST DAS FÜR EIN MISST WO DIE PROJEKTE TEILWEISE ODER AUCH GANZ VON ALLEINE VERSCHWINDEN??
DA IST MANB STUNDEN DRAN UND AUF EINMAL ALLES WEG !? ICH KÖNNTE IM KREIS KOTZEN
Google translate was not a lot of help here…
I think, from what I could get from the translation, that the OP has somehow lost his entire project due to a crash, not backing up before upgrading, or somesuch disaster that has left him without his project. I also think that the meaning of the second sentence is that he has spent many, many hours on the project and is asking if there is any way to retrieve it and if not or with what is happening now he is sick to his stomach which is attributed to the loss of his project.
So, to help him we need to figure out or post some links to unity project retrieval methods or recovery methods for his OS or HD.