Over 4 wks ago I caught a cold. Next day
As explained below.
Hello and welcome to "Ask A Doctor"
I have gone through your query. Viral infections usually subside on their own with symptomatic treatment. As you are having a sinus infection it is better you start on antibiotics such as Augmentin (Amoxicillin-clavulanic acid). These are prescription only medicines so you will have to go to your physician for the prescription. You can take Tab. Singulair which helps for asthma.
Meanwhile, you can take Pseudoephedrine which is available over the counter for decongestion and sinus relief. Steam inhalation and drinking warm lemon juice with a tablespoon of honey every day helps build immunity and clear airways.
I hope this helps. Please feel free to discuss further.