feeling empty

Feeling empty inside as you describe is most often associated with thoughts, feelings, and behaviors that are very challenging to live with and to work your way through. It is important that you take this seriously.

One approach that you might want to check out Dialectical Behavior Therapy.

While it is true that DBT was developed for treating the varied and group complex of traumas and coping efforts that are most often lumped together under the heading of Borderline Personality Disorder (most charitably referred to as a "waste basket" diagnosis and less so as a "these people are really hurting and it's very hard and scary to work with them all the way through it"), DBT has proven over time to be helpful.

Just be careful about people who want to diagnose too quickly. From my experience any diagnosis is dangerous because once it is made, everyone tends to stop thinking and tries to justify shoe-horning everything within that explanation, and that of "borderline" is especially so, but it can happen with anything.

An experienced mentor once told me to remember that the purpose of thinking is to be able to stop thinking and the difference between mediocre and great in therapy is to never assume you have anything all figured out.

Whatever course you choose, if it feels like people aren't really listening toyou, fire them and find someone who does

Feelings of empty mean that you do not have self or identity. You are a product of your surroundings. You feel alive by what others tell you about you or your job, or your other labels a doctor, a lawyer etc.
You think like I am happy because John, my neighbor smiled at me. NOT I am happy because I FEEL happy.
You may think I am sad because Suzie, your g/f said she is sad. NOT I am sad because I am hurt by the words of Suzie saying I am not thoughtful...etc
Do you see the difference? You are not here. Your self is erased.
You probably have a very authoritarian parents that made you only see the world through their eyes not your eyes.
therapy that specialises childhood and core beliefs will do a service to you.

My thoughts on a big empty hole in you? Attachment trauma. Look for Bowlby and Ainslie on the subject and see if it fits.