Can you be fired while out sick under doctors orders??

There is no law specifically prohibing an employer from firing you because you have the flu or due to a minor illness. However, if you were eligible for leave under the FMLA because you had a serious health conditioni within the meaning of the FMLA, you could have a potential claim under the FMLA. You should check with an attorney or the US Dept. of Labor, Wage & Hour Division to determine if you qualify for coverage under the FMLA. In addition, if you were covered by a union agreement, the union agreement may also be a source of protection.