This thing will be here forever. Won't we eventually evolve to not have bad side effects? Maybe the nasal vaccine will be better. Maybe sinus rinses become as common as brushing teeth? I don't know, but somethings going to have to give because we're all going to get this thing once a year for the rest of our lives.
I'm not trying to be the flu person either, but the flu does cause similar issues with the heart
There are a few studies. Some are inconclusive, some say it helps shorten infection and prevent hospitalization, some say it doesn't do anything. It doesn't hurt so why not. I have bad allergies already. The virus is doing all its replication in the nose so if you can reduce particles there, it might be beneficial. I think some of the studies are using a little iodine so maybe that's needed instead of just salt.
I'm not trying to be the flu person either, but the flu does cause similar issues with the heart