The antibiotics for UTI plus your ongoing rhinosinusitis may cause smell disturbance and a quick nasoendoscopy test will reveal whether there is active bleeds.
If you are taking nasal sprays, ensure your technique is correct as incorrect technique often leads to nose bleeds and you end up not using the spray any longer.
You ought to get a specific IgE blood test
to figure out what your allergies are and if your nasal congestion
persists, a CT Paranasal sinuses
would be important.