I wasn't sure what you meant with the term death march, so I looked it up on Wikipedia. I am still not sure what you mean exactly, but I am sure it is not a fitting metaphor.
That explains it. Maybe I am overly sensitive to this, because I am German, but I still think it is not appropriate to compare your own suffering of working hard for a couple of weeks, to that of those who were forced to march into their death during the Holocaust (or other times). That it is a common term does not excuse anything.
