Yes I do have a suggestion - have your upper teeth checked. I had an assessed tooth (upper R back) that was never seen on sinus CT. It was only found after the infection ate thru the bone and caused a sinus tract into my hard palate. My ENT biopsied the "bump" in my mouth to make sure it wasn't cancer (it wasn't). About a week after the biopsy the bump returned. Asked my dentist during routine exam about it and he said it could be caused by my teeth. Did some X-rays but unable to see that area clearly since it was so far back so he referred me to endodontist who did a CBCT scan and found the problem. If you've had dental work on those teeth it's very hard for a regular sinus CT to pick it up because of "artifact." I actually had another sinus CT done after my abscessed tooth was being treated and the missing bone and tooth abscess were not seen. I mention your teeth because you said you had a "bad side". If you search "unilateral sinusitis" results will come back as probable tooth involvement