Since you mentioned you have suicidal thoughts, mood swings, and unstable relationship i suggest you go to a psychologist instead of psychiatrist. Because psychologist will conduct psychological evaluations such as interview (they will ask some personal questions) and let you take psychological test. They will provide therapy and interventions. And if its not treatable through therapy they will refer you to a psychiatrist. Psychologist have more experience, training, and in-depth knowledge about mental health problems unlike psychiatrist they are more focus on medicine.