I'm sorry about this. Unfortunately I don't quite understand what they are exactly.
I just know that for other things flooding my brain and not getting out so I can have some peace something like doing a puzzle would actually help. I mean a real puzzle on a table. But when the thoughts (whichever ones) were so prevalent that I could not get rid of them (or even get them to calm down) with the normal methods I use(d) (like watching tv and surfing and having a book beside me just in case, all at the same time), I would need to set my brain to give me an alarm when I would notice that I was thinking those thoughts again. I can set my brain so that an alarm goes off when I notice something. Difficult to explain. When something is physically itchy I will focus my brain on telling me when I am scratching it. Once that alarm goes off, I will focus on not scratching again but will e.g. do the dishes because my hands are busy and can not go back to scratching. By the time I'm done with the dishes, the itchy spot may have calmed down. I do the same with thoughts that just keep going round and round and round and exhaust me in no time.
Once that alarm goes off for those thoughts, I will focus consciously on e.g. the puzzle. In the most difficult cases, I will talk to myself out loud saying things like: Okay, it's a 2000-piece puzzle. Sort out the corner pieces first. You found the upper left one, now look for the other three... I talk myself through what I am doing at the same time. This way I can "exaggerate my way" into that other focus, the puzzle, and away from the thoughts. I may have to refocus several times before it works, but usually it will.
It could maybe also help to talk out loud about what you see: There's a black tv in the corner of my living-room. The channel that's on is called VOX. The tv is on top of a sideboard. The sideboard is made from metal, read in color. A type of tomato-red. It has two locks that are silver. ... It does help me to go into great detail because that is pure focusing. Eventually, I will have gotten over those thoughts for the time being (and for some hours) and if they come back that alarm is still set and will go off earlier and it is much easier to get out of those thoughts.
This may not help you at all, but it's maybe worth a try. If you do try, make sure to not give up after fallbacks. Reset the alarm, refocus and go. Be your own boot-camp.
Can someone come over to talk a bit about whatever? Would you like that?