I'm very sensitive and emotional. I also feel I have an addictive personality to substances, or perhaps it could be an oral fixation?

Beats me. An answer to your question requires a full medical and psychiatric history, and lots of questions about your growing up, your experiences, your reactions to those experiences. These questions need a therapist who spends the time with you and gains enough of your trust to give you some answers. Freud's oral theories really arent believed anymore. No quick answer is gonna help you. Get a referral.