> Was the first person in the history of my university who was both a fulltime student and full time employee.
Okay? Why is that something to brag about. Like when you deconstruct that, is it really something to brag about? Its fine that you wound up having the capacity to excel in that situation, and have external validation that you did, but is the environment that pushed you into that really useful... for you? Congratulations on being able to provide for yourself and others. What are you actually interested in? What would be a better use of that bandwidth if a degree and professional attainment wasn't your goal?
> I’m really only working for the health insurance.
Come on. So half to 100% of the premium is paid by your employer. Okay. Is that really making a difference? You can likely keep the exact same plan without that employer and your investments should be able to cover that as well, if your past successes were really worth it (literally in this case) as described above, deep down you knew that right?
> But I've never been more unhappy and lost.
Back to my original point. Are these really the highlights of your life? That seems to be the primary point. You won the career-necessity game. You beat the wage-slave level.
Do you have other interests? Are you interested in having other interests? Sounds like you need serotonin and dopamine kickstarts.
> I told my therapist that I feel like I've hit my mid-life crisis, though not your typical one as I'm not going out and buying a muscle car to cruise high schools.
Not like other guys(tm). You're not special and your prior professional accomplishments have delayed you from accepting this earlier in life. Maybe you do need to buy the muscle car and see what you were missing. You might find that you like it.