Deborah,
The concept of "sex addiction" is not universally recognized or accepted by all clinicians, and refers to people who compulsively and/or impulsively seek sexual experiences. Signs of sexual addiction include persistent pursuit of self-destructive or high-risk sexual behavior, repeated unsuccessful attempts to limit or stop such behavior, severe adverse consequences (medical, legal, interpersonal, etc) due to sexual behavior, excessive amounts of time spent in obtaining sexual gratification, and sexual behavior causing impairment in social/occupational/recreational activities.
Masturbation is a common and normal activity, which only becomes "pathological" when it becomes a compulsive action that is beyond a person's control. It would be unusual for anxiety, anti-anxiety medications, or oral contraceptives to be the cause of your sexual activity or impulses. You may find it helpful to seek evaluation by a mental health professional, who may also help resolve your feelings of guilt about masturbation.
RaxDax
RaxDax