Neti pot w/ saline rinse. Daily. It cleans out the sinuses and prevents bacteria from growing up there.

It sounds like this is a recurring thing.
How hard are you training?

Hard training can weaken the immune system. Training too hard weakens it even further.

This is why First Endurance Multi-V and other products claim to reduce upper respiratory tract infections (Not a product endorsement, just a point of reference).

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I talk a lot - Give it a listen: http://www.fasttalklabs.com/category/fast-talk
I also give Training Advice via http://www.ForeverEndurance.com

The above poster has eschewed traditional employment and is currently undertaking the ill-conceived task of launching his own hardgoods company. Statements are not made on behalf of nor reflective of anything in any manner... unless they're good, then they count.
http://www.AGNCYINNOVATION.com

How's your diet?

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leslie myers
http://www.foodsensenow.com

Cold or perhaps allergies?

Carry alcohol sanitizer everywhere. Use it religiously. (And a gentle bar soap at home, since alcohol is a bit harsh).

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'It never gets easier, you just get crazier.'

Hand sanitizer, eat lots of fresh foods, actively avoid people that look like they are sick, ask on the phone prior to meeting people "if they are keeping well", avoid kids (bit tough for you), use Vicks First Defence in situations you know you'll be at risk, don't touch your mouth/nose with your hands, live like a hermit etc etc.

Vitamin C

Every night I take: garlic/mushroom pills, Spirulina pills, zinc, probiotics and emergen-c mixed with my electrolyte. It doesn't prevent me from getting sick, but I very seldom do. And when I do, it's very mild and is gone within a day or two.

I try to actively avoid people that are sick, but they keep on coming... :)

This. And rest more.