Dollar General

I've been working at Dollar General for 4 months and since then my hours have changed tremendously so beside this he also decided to give me the whole week off just because I called in sick its not my fault that I sick. When other employees ask for days off he doesn't tell them anything and when I do it he starts giving me this lecture about how I ruin everybodys day by calling in and he would also tell me that he could find someone very easily to fill in my position. I don't think a manager should ever tell that to his employees. I hope some one does something about these complaints because this is outrageous. Something needs to be done about this!