I don't feel guilty to be honest. I know I'm really! sick if I take a day off and not pretending. I'm a workaholic and people who know me knows this and if I tell them that I won't be able to work that means I'm really sick and have no energy to work. So I don't feel guilty.
I know me not being able to work will affect families but this is part of life. People do get sick like they do and I do get sick too.