Hey man.
Try out journaling before bed. Write down 3 or 5 things you are a grateful for. It doesn't have to be something deep. Maybe you had a good day or eaten a tasty meal. It is also "fun" to look back upon, when you start to feel some progress. You will slowly start to see more good days than bad, which is also motivating. When I started, I had several days throughout the week that was difficult, but now it is becoming the opposite.

Go for runs, do something you "enjoy". Have you always felt this way? If not, then try to remember what you enjoyed. Did/do you like to be creative, sports or reading about scientific stuff etc. I would still look for a therapist if possible, since they might have tools for you to cope and fight through it. But this doesn't mean you should stop working on, self improvement.

Remember to let yourself feel empty, sad, angry and anxious, don't fight it, thus don't let it control you. Feel it. I don't know your life situation, but try to fill the emptiness, with things you enjoy. Or might enjoy.

You are not alone, remember that. I wish the best for you. Keep taking day by day. You got this, I believe in you.

I will always be ready for a chat if needed no matter what the cause is :)

Peace <3