Perhaps no one told you...only use Afrin for 3 days, then wait 3 days before using it again. The steroids will help you a lot, but if you've not been on them before you need to know that you will probably feel strange after a couple days, will be puffy and bloated, may be very aggressive and not sleep, and be very hungry all the time. This is all NORMAL and will go away a couple days after the steroids are done.
Good luck, it sounds like you found the right doctor
Let us know how it goes. Clare