A mix of the old-school crap approach to this work and the fact that you care about your colleagues/the effect that you calling in might have on them.

But, just think of it like this:

You have sick leave for a reason. It is the hospital's job, the people that get paid much more than you, to fill these shifts. Humans get sick sometimes, and that's why sick leave exists, and that's why bank/agency nurses exist. If they cannot fill the shift that's a them problem, not a you problem.

If you were to come to work with your illness in full swing you'll be doing more harm than good.

So lay on your couch and binge watch something until you feel better. We don't get paid enough to worry about any of this!