Leashy11, I think you hit the nail on the head there... Stress does have a big impact on your immune system!
Chronic stress weakens your immune system.
Here's a cut & paste from a good article about it;
* People like to ignore it but stress is a big deal. In our society it can be unrelenting. Stress can come from both physical and emotional sources. Illness is stressful for example. Stress affects the hormone cortisol produced by the adrenal glands.
* In small quantities cortisol is helpful. It’s anti-inflammatory, speeds tissue repair and controls excess immune cell production.
* Continued stress raises cortisol levels. Cortisol slows the production of “good” prostaglandins. Prostaglandins (localized hormone like cellular messengers) are derived from essential fatty acids like fish oil. “Good” prostaglandins support immune function, dilate blood vessels, inhibit “thick” blood and are anti-inflammatory. Slowed production allows for the opposite - inflammation, immune suppression, etc.
* During a period of raised cortisol (from stress), immune system cells disappear from the blood. The part of the immune system most sensitive to increased cortisol levels are the Natural Killer Cells. Immune system function will plummet.
* As adrenals become fatigued, the production of cortisol and other hormone levels will fall. Lower levels of cortisol will allow immune system cells to circulate in excess."
If you want to read the whole thing it's righ here; http://immunedisorders.homestead.com/stress.html