obsessive ones were useful for many decades as they made me good at whatever was my field of interest.
BUT, concentrating to study and learn (self guided mostly, for the fun of it) can be hell, only short periods are possible.
i also have a BIG problem in settling to anything and also making a choice/ decison of what to do with my time; flip flop indecision i call it. Prev respondents here have cited anxiety as the culprit. I'm 55 now and never wanted to bring a child into the world because of this and some of the s**t experiences I endured, say school, early working life etc.
the only person i ever connected with, an online penpal has gone away, this is hell for me.
every third or fourth day i have to 'get away' into the wide open landscape and de-stress, to listen to nature sounds and silence across wide open spaces. i've lots of interests ranging over many subjects but a lifetime has proven I'll never get conversation on any of it. it wld be cruel to bring a child up in this house, the conversation and subject matter is so in advance of their peers.
Re yr specific question, it used to be worse with me, re chaotic thoughts, say two or three decades ago, prob because inputs too great, pushing myself too hard with constant work, I cld blow ie get intoa rage and I cld tell fro a second this might happen so used to tell my wife 'the red lights flashing' ... expect something ! !
my answer is self employment, books and subjects that capture and focus me, gardening is good too, but after doing it for money i find now I have lost all ability to do anything, indecision with also my brain increasingly is becoming a void, don't know what to do next syndrome ..... I was thinking of paying a person to stand with me as I garden, my garden now feels like the loneliest place in the world.
however, i can gain insights and fresh ways of looking at things that i don't seem to see coming from others, its not all downside being me.