Nope, not at all, even though I've spent quite a lot of time as a manager and know how sh*tty it is to have to cover for weak/lazy employees. Part of it is, if I'm sick enough to call in I know I'm not going be very good at my job, which really isn't good for anyone. Outside of this calling-in-sick scenario, I try very hard to remedy any guilt I feel for things I do, whether through making it up to whomever I've wronged or by working myself through the guilt by making myself understand that guilt is a worthless emotion. Guilt doesn't help me, and it doesn't help anyone else.