Sinuses

I have had sinus problems for a few years now but every year they get a little worse. So, a few months ago, I started getting allergy shots. They work really good but lately I have had wicked post-nasal drip. I can only take so much of it! I am so....tired of having all of these sinus problems. It just gets worse and worse. Anyway, if anyone has any suggestions, I'm open to anything!!!