Hi,I Have Had Persistent Cough For About Three Weeks,as Well

Hi,I have had persistent cough for about three weeks,as well as sneezing,loss of appetite,general feeling of nauseous behaviour.I've also had a blood test which came out normal apart from my blood count which is borderline-I've had an X-ray which apparently showed nothing untoward,but from the middle of September I've been feeling unwell,first I got a serious sinus infection,which spread to this persistent coughing.Please help-the Doctors don't seem to care!!