Acute sinusitis won’t go away Can someone explain a typical course?

I got a minor cold like others in the household but within days I had the full flu symptoms with it and coughed up colored phlegm. That’s a whole month ago now. I saw my ENT after a round of Ampicillin +Clovanix didn’t budge it and he prescribed a different antibiotic plus a Medrol steroid pack. I still feel horrible and now have laryngitis plus probable bronchitis. What’s up with this? I don’t understand how it can get worse while Im being treated. My doctor did order a CT but that’s more than a week away. I do have a primary immune deficiency but my doctor knows that. I had a brain MRI this year that incidentally found I had some opacification of my frontal sinuses though the implications of that I really don’t know. I also really wonder if this was Covid. I tested myself twice and was negative Then today CNN had a reference to the old test kits and whether they’re picking up the newer strains. Just looking for others experience when these things drag on endlessly while still feeling so crappy