It depends how it’s affecting me. I often try to pill up and sleep through particularly difficult illnesses, whereas other things I suffer from like vomiting, there’s not much you can do other than hold the bucket.
If I’m poorly but the physical effects are manageable - as with my chronic illnesses - then browsing the internet, reading, watching Netflix would be thing’s I’d try to do to help pass the time when there’s little else I can do.