I Initially Had Allergy, I Believe. I Went To Work,

I initially had allergy, I believe. I went to work, I was exposed with someone who had an infectious process, for 3 days. And had severe chest and nasal congestion, unable to sleep through the night, I did take tussins, and any fluids i can take in, to no relief. I went to the urgent care and i was prescribed z-pack and Proair HFA inhaler, because I started wheezing as well. I first lost my voice, now i have trouble hearing. I haven't been back to work, due to the offensively loud coughing. and of course, i had to be sensitive to the feelings of my co workers. I completed my Z pack yesterday, I had one time expectorated a thick yellow phlegm and nasal secretion. Now it's all moderately thick secretions. My question is, instead of taking the cough and cold remedy, can i take Claritin instead to dry me up, because i am finding out, when i need to blow my nose, i also ctart coughing. Anything you can advice me to do and what not to do. Thank you.