About three weeks ago i was on antibiotics for bronchitis..or phneumonia..i still have a violent cough am extremely tired and now have lime greephlegm?

Still infected: The history of continuing cough with the discolored phlegm makes me concerned that you may be only partially treated. I would check with your doctor and consider another course of antibiotics and would choose a different class of antibiotic if in fact another course is to be prescribed as you may have a resistant organism to the first one used.