Sinus Medication Solution

i’ve planned on going to my best friends house for over 2 weeks now, but i got sick last sunday and i am still sick, so i went to the doctor today and was told that i have a sinus infection and maybe a touch of bronchitis, so i don’t know if they’ll have a chance at getting sick too if i go over there or not. i don’t know what to do

About two weeks ago, I had a sinus infection and was given pills, and I have to finish them until they are gone. So just a few days ago, I’ve developed a phlegmy cough, and it’s especially at it’s worst when I am laying down. I want to know if it would be okay to take a cough drop or tylonal when I am on antibiotics. I don’t want a bad mix of medicines.