Ok, back now!
I have some opinions about what you've written, but remember that's all they are and I'm not qualified in anything related to psychology.
All though maybe that's a good thing!.
I also may be going to far to fast, and that's a problem I seem to have, so let me know and I'm explain things.
I think you are looking for happiness in the wrong place.
It doesn't exist external to your self it comes from inside you. The more you chase it the more you'll fail.
Want proof?
I would guess you feel pretty happy doing MMA. Your mind clears and your life troubles are absent for a while. That means that MMA makes you happy?
Not so much.
You generated the happiness by having a quietened mind and thus got closer to your true self.
"What's searching is what you are searching for." Think about that as the greatest truth you can come to is in that phrase.
You have thrown yourself into the physical side of MMA but neglected the spiritual side, and there is one.
“If there is a God, he is within. You don’t ask God to give you things, you depend on God for your inner theme.”
– Bruce Lee
Everyone is chasing happiness and there are hundreds of books about it. Most people "know" happiness is fleeting, it's in your favourite food, movie or sport and then the world comes back.
All that is is a brief cessation of thoughts, long enough to feel at one with what you really are.
All you have to do is find out what you are. Martial arts can help as the truth of being is intrinsic in many of the arts, especially Kung Fu.
There are many ways to the truth of who you are; religion, eastern spirituality, yoga.
I got there through physics.
I woke up one morning with a thought that I had to find out what the nature of reality was, and what happened when we die. I started with mainstream physics, then quantum physics, then I read a book called Biocentrism by Robert Lanza, which is one of the best books I've ever read.
One idea proposed is that consciousness is fundamental to the universe. Without consciousness there is no universe. This fixes many Quantum mechanics problems, and explains The Hard problem of Consciousness. The author also said that we need to look more closely at the wisdom in eastern mysticism as it can lead us to the truth of the universe.
Terrible thing to tell an Aspie.
I did look, for about 3 years.
It took a long time (but far less than most people) to find the truth of myself). Mostly because there are so many paths, and they all lead to the same place.
Eventually I found what is probably the shortest path, and that's call the Direct Path to enlightenment.
It's based on Advaita Vedanta, and maybe a bit of Zen. Both are great, but longer paths.
The most basic truth of your experience that cannot be denied. the only thing that you can be sure of is "I Am".
What I am is the silent witness of experience. You can find that your self, and it's not hard.
Think back to when you were a child. The "thing" that witnessed events when you were a child and the "thing" that witnesses events now is the same. It's identical.
Everything else has changed.
You are what doesn't change.
Maybe that's a bit full on for now?
Chill out with a video;
Rupert Spira is one of my favourite non-duality teachers. Very clear and succinct path to enlightenment.
I'm away for week over Christmas, but will be able to write short posts.
Have a great Christmas.