I Have Had A Persistent Dry Cough For Almost 8

I have had a persistent dry cough for almost 8 weeks now. I have been to the doctor twice- received a shot of antibiotics, 2 different types of cough meds, antibiotics to take at home, I have tried numerous over the counter cough syrups, about 10 bags of cough drops, etc.... I did begin to feel better for about a day or two and the past few days it has came back and is worse than before. Should I go back to the doctor again?