I use to be the same way. This is what I do in the winter now and I rarely get sick anymore.
Natures Plus Immune Action (2 caps per day til bottle is gone - to prevent sickness)
Nutrabiotics Defense Plus (2 caps 3 times day while sick)
Sources of Life Multi Vit w/ Iron (3 caps in morn)
Sources of Life Multi Mineral w/ Iron (2 caps at bed)