As with most things in life, it depends....do you have an employement contract? How large is the organization you work for? What is the sick leave policy? Have you been out longer than the sick days you accumulated? There are several factors that must be considered when determing whether or not termination is justified...and in some states employees may be terminated without cause. You state that your employer is calling you on your cell phone while you are out sick...perhaps he has a question about a project on you are qualified to answer? You may want to wait and see what happens and I do hope you feel better soon!