DEAR HARRIETTE: I have contributed to a number of charities over the years. I feel good about that, because I want to support causes that I believe in. But I am uncertain as to what I can give right now that I have been laid off from my job. I am single, and I live on my own. I have no idea when I will get another job. I feel horrible that I cannot be generous right now, but I worry that if I cont…