Hi karen ! Relax! Don't go for ct scan
as you already did and it has radiation
too. Now about your nose.! If you went to an ENT and he told you that your nasal turbine are large. That is why you can't breath and allergy
symptom. at present take care of your brother. try home remedies
for some time like vicks
or special capsule are available to pour into hot water and inhale. Avoid too hot or cold temprature. Later if you get time go to ENT in govermental hospital for check up, if they say surgery is needed then you have to do. As i think i lived in russia, now i india . Operation are free in govermental hospital. Don't worry operation is very small. Relax ! Take care and think about it. Wishing health to your brother. Bye.