Welcome to HealthcareMagic Public Forum
Following problems like mood swings, feeling empty and getting angry easily can occur in psychological problems like: Personality issues and bipolar disorder
If problem is prolonged or severe and leading to frequent interpersonal problems, then for assessment and treatment, you can visit specialist like psychiatrist
I hope this information has been both informative and helpful for you.
Wish you Good Health.
Dr. Ashish Mittal