e. expressing an alternative. In other words, "I'm just gonna get up and go to work" is an alternative thing that this person might do.
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"or else" is a more elaborate, or emphasised, way of saying "or", i.e. expressing an alternative. In other words, "I'm just gonna get up and go to work" is an alternative thing that this person might do. This is a humorous or sardonic way of making the point that he/she might, after all, think about him.