Seems like lately I am becoming errand girl for my friends and neighbors. This is a role I can't take on as I never know how I am going to feel from day to day, moment to moment. I try to express the fact that I don't feel well and that I have enough of my own errands to do, but people just don't get it. I would like to keep the few friends I have, but on the other hand I feel like I am being taken advantage of. How can I let them know in a nice way that I am not available to take them places and run errands for them?