Sinus Medication Solution

I’ve tried many over the counter remedies, but I always lose my voice and it stays bad until some time in January. It doesn’t seem to be contagious, I would love to find out how to get rid of it, and get my voice back!

I was prescribe amoxic for my sinus infection but at the end of taking my meds it seemed to turn into a cold. Is this possible?

I expell it sometimes but it seems to constantly be there. I blow my nose alot and go through tons of tissues. Is it true that a nasal spray with steroids in it are helpful?