NOSE BLOCK & LOSS OF SMELL. A day. with!

Dear Dr, don't match this issue with covid 19 at this movement because I am facing this every year 2 times. During weather change. Whenever I suffer with extremity of sinus , I will experience nose block, cough, throat congestion and uneasiness for week to month. This is the thing going on since 20 plus years. This time I have nose block since 3 to 4 weeks and loss of smell . Weather  in Bangalore is slightly different than early years. I tried sinarest for 3 days. Every thing was cleared but repeated after 4 days of medication. Allegra 120 is not supporting.OTRIVIN drops helps only for 2 to 3 hours. My wife and son also has same issue. No cough, very very very mild pleghm, no fever, no pain, no mucous, only repeated nose block and loss of smell. Rest vitals normal. Note: I have IBS C (occasionally) Please suggest medicines with course. No surgery ideas. I am on bisoheart 2.5mg, Aztolet 10 mg, gabapantin 100 each one a day. With regards