swear by airborne at the first sign of any cold take one tablet 4 times a day ideally you should take one tab a day with water to avoid being vulnerable to anybody else I have not been sick in over 10 years by airborne

Cutting down on inflammation helps. Supplements such as Curamed and Curamin are high potency and keep bugs away. Also eating prebiotic and probiotic foods are helpful since your gut is half of your immune systeme. Kefir, kimchee, brined foods, cultured foods, yogurt and kombucha can help with the good bacteria.

Might add vitamin C to that. Or look up immunity building supplements online. Vitaminshoppe.com has a lot of good stuff.
Are you sure it's not allergies?

I take 3 ibuprofen twice daily it takes the edge off

I take echinacea and 1000mg of vitamin C which helps. With the echinacea take it in a cyclical pattern. 10 days on and 10 days off. Hope this helps