I am experiencing pimples, cramping pelvic pain, abnormal vaginal discharge (quality: itchy, cheesy) and rash on chest.

Various symptoms: I don't feel that these varied symptoms are related to one disease process. Your vaginal discharge may be a vaginal infection. Pimples and chest rash are nonspecific. I recommend an examination by a gynecologist in view of your pelvic discomfort and probable vaginal infection. A dermatologist can evaluate your chest rash if it persists.