I've always had imaginative universes with beings in my head. I could stare into nothingness for hours, just imaging characters in different environments interacting with each other. Entire movie scenarios. I used to love this. One major outlet was roleplay with other people on websites. For as long as I can remember my presence on the internet, I engaged in this way with people.
But only when I wanted to, and I could stop the thoughts when I desired.
I think, about one and a half years ago, this has been happening without my consent. At all times, it feels like part of my concentration, mind and energy is being occupied by this. The last few months have been especially bad, sometimes I feel like my head is exploding, as I can no longer handle this omnipresent noise. I broke down a few times in tears, my colleagues were are getting annoyed because I can't focus and do my work right. Today has been the worst case. I had a good talk with some people from work, that helped.
Music and photography calm me the most, clear my mind allow me to focus.
disclosure I dont know you in real life, and I am certainly not a doctor or qualified to talk about doctorie things. I am just a random guy on the internet.
But you quite possibly have ADHD. Its common in children, but it supposed to fade out when you get older.
I have the same thing, my mind is always spinning with ideas and thoughts that make it near impossible to focus.
It would never stop, meaning that I could not sleep either. I had to go for a 8km jog every morning at 4am after an entire night of not sleeping so that I can come home and be tired enough to get SOME sleep before school. I used to literally be afraid of going to sleep, because it was a terrible experience for my whole life.
2 solutions out there as I see it
1 - Get yourself tested and enjoy the fuzzy feeling from all the drugs that WILL be prescribed to you. (I dont suggest this)
2 - Get clear of the internet. This includes facebook, this place, reddit, wikipedia, ANY SOCIAL MEDIA. All of it.
Replace those with reading real books written by people who thought about what they where writing about, doing hobbies, sport, learn a skill. For every 500 posts you have here, you can equate that to about 1 real life skill you could have learnt.
What I found was that the internet over stimulates my mind. There is too much "new" information, so my brain got used to jumping ideas all the time. You never need to hold one idea in your mind for too long here. Think about how FB, twitter or any other "social media" app works. You get quick bites of information by continuously scrolling down, it never ends, and your brain is begging for the next "exciting" picture/post/headline. You never need to focus.
This carries over when you need to function in real life, your brain wants to jump ideas all the time. And if you have the ability to get lost in thought as I do, your mind will go there if it gets a bit bored of the current situation.
This is what I try to do. I have clearly relapsed these last few days, because I am here now.
If you want a good book to read that will help you understand, I can suggest a lot. Just PM me.