What I did was I made myself pick 2 days in the week to work on this game, those 2 days I commit myself to game development in any way imaginable. At first this promise I made to myself didn't really work because my mind easily drifted off towards assets for my game and how to implement them any moment of the day. So then I started using a notetaking app on my phone and allowed myself to jot down any idea I had during the day and not think about them further. At the end of the week I would organize these notes.
I still got fatigue from all these ideas I kept having so I had to go further.
So then I made a place away from home to work on the game and made myself promise to only work on the game at this specific place, this seemed to really help me. Maybe it helped because I now associate this other place with the game so that I could return home to relax instead of "think about work"
I hope that this might help you in any way, don't give up and try to organize your thoughts! Looking for help is a very courageous decision, you don't have to do it alone :)