HELLO, I STARTED WITH WHAT SEEMED TO BE A COLD

HELLO,
I STARTED WITH WHAT SEEMED TO BE A COLD 3 WEEKS AGO. I STARTED A ZPACK, IT HELPED. ABOUT 4 DAYS LATER I STARTED A SORE THROAT WITH ITCHING AND POST NASAL DRIP. I STARTED TAKING CLARITIN WHICH HELPED DRY ME UP, BUT NO CURE. GOING ON WEEK 3 THE COUGH IS GETTING WORST WENT INTO A URGENT CARE AND THEY TOLD ME I HAVE A UPPER RESP INF AND TO WAIT IT OUT AND PRESCRIBED ME A STEROID PACK. I AM STILL HAVING UNCOMFORTABLE SYMPTOMS OF ITCHING, COUGHING AND PERSISTENT SORE THROAT WITH A THIN CLEAR MUSCUS. PLEASE HELP.