I've spent years feeling like I'm floating through space, so I know how bad it is, I'm sorry you're having to go through this.
What's helped me is focusing on real world issues, like self-support in self-talk. How often do we beat ourselves up in our minds? Change that. Defend yourself in your mind, always. Negative influence didn't come from you, challenge it.
Change thoughts by repetition so they become automatic. If you have your deeper self on-side and working for you it's a snowball effect.
Also, natural source b-vits (I take spirulina) and a little l-theanine helps a lot.
Are you better now? I am a ghost. Its like you could walk right through me. I feel like my life is so useless.