I woke up with a dull headache at the back of my head. I have sinusitis now is that normal? I am done with 10day atbx but secretions still yellow.

Needs evaluation... If you are still having headaches, nasal secretions. sinus pressure it might be possible that you didn't respond to that antibiotic, however this needs evaluation and in order to give you a final answer on what is going on. Make an appointment with your doctor in order to get checked and treated as needed.