How much are you willing to do to not get sick 'all the time'? There are measures you can do to avoid getting sick, or if you do get sick lessen the severity and duration significantly.
Do you smoke? You have to stop if you want this to have any chance of succeeding. If you drink, stop the second you think you might be sick. Or stop drinking altogether.
Eat clean. No processed foods whatsoever. Avoid the 3 white devils: Sugar, Salt, processed flour. LOTS of cruciferous veggies(Kale, cabbage, brussel sprouts, etc.) every day. Also, beans, nuts and seeds.
Does your home have an air filtration system? Change those filters a couple of weeks before they recommend. Also, most cars have 'cabin air filters'. Change that too. Very easy to do. Youtube is your friend.