Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain the symptoms of breathlessness due to congestion or stuffiness in nose as well as bad smell in nose is most probably due to
sinus infection only as you already have a history of
sinusitis..
You should consult your treating physician or an Otolaryngologist and get evaluated and he can advise you antibiotics like
Levofloxacin, anti-inflammatory painkillers like Motrin or Aleve, decongestants both oral as well as nasal like Pseudoephadrine or
Phenylephrine, steam inhalations and use a humidifier in your room..
Saline nasal sprays and steroid nasal sprays can further relieve..
As of now you can start taking steam inhalations with a few drops of eucalyptus oil in boiling water.
Take nasal decongestants like Otrivin or
Nasivion for opening up nasal passages..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.