While playing a game, one of the characters said (the text is in English and the voice is in Japanese):
- 君はずっと働きずめだったから、今日はもう寝な。
My conjecture is that the correct written form is 働きずめ, but is that correct? Is it 働きづめ or 働きずめ? Moreover, are there any other words constructed with that same suffix?