Our chat has ended, but we can still converse for a week or more.
I'm sorry you have that yoke to bear in life. My wife does too. Both depression and anxiety--and so does our daughter, who is also 26 and has a debilitating genetic disorder (what's your birthday?) When I taught about personality development in college (I was full time in both Psych and Humanities) I stated that depression would work during prehistory for defeated or enslaved tribes to help them die off so they wouldn't use up resources that the dominant tribe controlled. But depressed genes have survived, because those that bear them have to work harder to find ways to be recognized as useful to their society. So perhaps you really do need to be doing something special that benefits those around you. Anxiety is related to shyness, making it very difficult to be successful in extraverted careers. Perhaps it's actually something introverted and creative that would fulfill you. Check out the self test for Highly Sensitive Person online. (My wife and I are both HSP, she's a reader, former therapist, writer musician and jewelry artist. I'm a furloughed professor, therapist, writer, musician, and solo-hiker.) For if you really NEED to be doing something that Highly Sensitive Persons are oriented towards, then it's not too late to set up a plan to get there and do that, even though it's not what you might have expected to do. For depressed people are NOT depressed when they're creative in ways that fit for them--and the varieties of your elevator-fall dreams might have clues to what empowers you to walk out of the enclosed shaft into the Springtime of budding creative life.
You could also take the self test for your Jungian Type at www.humanmetrics.com and report your results on both to me--for the Jungian Type also points toward types of careers that are more likely to be fulfilling.
Since you already pay some attention to your dreams, you can choose to embark on the Jung***** *****fe-path of "Individuation" which is guided by regular practices designed to bring your conscious mind and its thought- and learning-experiments together with your unconscious mind that expresses itself symbolically through dreams and unexpected high energy sparks within a momentary encounter, which Jung, in correspondence with German quantum mechanics genius Wolfgang Pauli, called "Synchronicity" (yep Sting isn't the only Brit who's lit up to that type of dramatic recognition). So you could keep a dream notebook and learn dream interpretation--though the fullness of interpretation usually requires an adept outside of yourself, because you're too likely to flatter your ego with interpretations your conscious mind expects or likes.
There are many such practices developed by religions and yogas throughout the world. They include meditations and prayers, where both can awaken the same energies that are at work when dream-film-clips are presented spontaneously every night. So when you meditate on a question (such as related to your yearning to start your own business) before sleep, you can get a dream that makes you aware it is a response to your question. You can also learn to do Tarot readings or more easily throw coins to look up I-Ching readings (Jung helped bring that Chinese oracular book to the West, whose aim is to train thoughtful people to become wise in the DAO of going with the Cosmic changes). If you pray for particular qualities or forces to manifest themselves in you (like perhaps the craft-or-grace to transform anxiety into beneficial energies)--or the love to experience the beauty and greatness in others--then your synchronicity-adventures could show you the rapid response of your outer world to such inwardly repeatedly reinforced intentions.
What I'm suggesting is that an anxiety disorder may be a manifestation of a unique energy-frequency that actually requires tuning of your personal conscious focus to it--which nobody is ever taught how to do--in order to convert it into a highly effective but "abnormal" quasi-electrical matabolic rate for consuming your body-mind-caterpillar experience through your human-kind and bioelectric outer world.