re: Sinus infections every 3 months

Allergy shots (they can take a long time to work, sometimes more than 1.5 years, ask about an accelerated schedule), Zyrtec/Claritin/Allegra, and flonase/nasacort/nasonex/dymista (dymista also contains an antihistamine so if it's cost prohibitive you can get astepro and flonase separately). Throw in some nasal rinses, but don't do it if one side is completely clogged. If it is, go for a run or take afrin (amazing stuff) then do the rinse.

If you feel a sinus infection coming on or currently have one, take afrin twice a day for three days (and no longer, trust me) while doing the rinse. This should take care of things.

Keep in mind that flonase and whatnot can actually take several weeks to completely take effect. Sometimes different nasal steroids work well for some people and not for others (same with antihistamines).

Now, getting a sinus infection every three months is certainly not normal, especially once your allergies have been addressed with the shots. Ask your allergist about doing blood work just to be certain. Also ask about the pneumovax vaccine, it addresses the most common bacterial culprit of sinus infections. There are a few other vaccines to consider but you should have them and your allergist should test you for them just to be certain.

That being said, see a good doctor (PM me if you'd like) and make sure no structural abnormalities are present. If they are severe enough, nothing aside from afrin will give you true relief (maybe not even then and it will still not be ideal for your breathing and sinus health). Procedures to consider: functional endoscopic sinus surgery (FESS), ballon sinuplasty, septoplasty, and turbinate reduction (preferably with a microdebrider and a possible outfracture).

There are other potential causes to consider, but they are rare and should be considered after all of this has been addressed.