I think it is about bugs(Candida??) leaving your body.

Went to dreammoods.com and copied this for you.
Hope it helps.

To see a spider in your dream, indicates that you are feeling like an outsider in some situation. Or that you may want to keep your distance and stay away from an alluring and tempting situation. The spider is also symbolic of feminine power. Alternatively, a spider may refer to a powerful force protecting you against your self-destructive behavior. If you kill a spider, it symbolizes misfortune and general bad luck.

To see a spider spinning a web in your dream, signifies that you will be rewarded for your hard work. You will soon find yourself promoted in your job or recognized for your achievement in a difficult task. Spiders are a symbol of creativity due to the intricate webs they spin. On a negative note, spiders may indicate a feeling of being entangled or trapped in a sticky or clingy relationship. It represents some ensnaring and controlling force. You may feel that someone or some situation is sucking the life right out of you.

To see a spider climbing up a wall in your dream, denotes that your desires will be soon be realized.

To dream that you are bitten by a spider, represents a conflict with your mother or some dominant female figure in your life. The dream may be a metaphor for a devouring mother or the feminine power to possess and entrap. Perhaps you are feeling trapped by some relationship.

http://wolfs_moon.tripod.com/SpiderTotem.html

The spiders will represent an emotional aspect of yourself from which comes a very particular inclination or motivation.

We usually associate spiders with the idea of building webs and trapping unsuspecting victims in them. Thus based on the function that God gave the spider, we can relate the spider with the idea of self deception. The web is “the web of illusion” into which aspects of the self (the unsuspecting victims) have fallen. The spider can be regarded as a feeling of deceiving yourself about some issue or situation.

Most women seem to fear spiders. For any female who is supposed to know their feelings well, nothing is more scary than to think they could be fooling them self in some situation.

On a physical level of interpretation, the spider can represent a person who gives the impression of being deceptive or untrustworthy.