I also recommend going to see an ENT. I used to be a nasal spray junkie. I used so much Afrin® that eventually, the spray had no effect on me and felt like I was squirting water up my nose. I switched to 4-Way® spray and had to have a bottle on me at all times. The breakthrough was when I had sinus surgery about 15 or so years ago. They corrected my deviated septum and roto-rootered my sinus passages, and I have not needed nasal sprays since. I still wear a Breath-Rite® strip to sleep at night.
Was given Afrin by a friend's father who was a doctor, back in the early 70's to help clear my sinuses. I continued using both Afrin, and generic brands of nasal spray until 3 years ago. When I went to the ENT after I'd quit, he told me I was lucky...that he had seen people who had used nasal sprays for years that ended up with actual holes inside their nose. I use Breathe Rite nasal strips every night, and saline solution occasionally. The ENT told me I have a deviated septum, but didn't recommend surgery, which is fine with me. I may snore more, but there's nobody here to complain...so who cares. At least I'm off that crap.
The turning blue thing is not a legitimate danger. The reason for turning blue is due to impurities in the water when making the Colloidal Silver, not due to the silver itself.
For instance, some folks put salt in the solution to increase electrical conductivity of the water, thus speed up the process. This is a yuge no no.
The salt breaks into its component elements and either the NA or CL then readily binds with the silver. That is the thing that turns people blue, not the silver itself.
Properly made CS will not turn you blue if you use it every day for a hundred years.
That said, it is not for internal use. Nasal passages do not count as internal, in this case.