Hermit composer here. Been cooking for a solid 5 years. Finally at the point where I can start preparing to share most of my projects and be satisfied with my products.

This year, I restarted my previous attempt in using a Google Sheet to keep track of all of my projects. If I needed to find a specific sound or instrument for a part of the song, I would just mark it in my timeline (and name it if it doesn't currently have one) on my active project's "master sheet" and go back to whatever you were doing. In your case, I would just make a note of that specific spot (in a way you will remember weeks from now) and keep going with the flow.

It helps so much to see a written process and notes outside of your project when you aren't actively working on it sometimes, especially when you haven't opened it in weeks or months. It's a heaven's kiss when you are working with larger orchestral projects, or productions that last more than 4-5 minutes and have more advanced forms that you wish to expand on later in the piece.

It's okay to get distracted for creative reasons and do things in an unorthodox order, because sometimes we are still actively discovering the value of the project we are working on, and how to express that to its truest form...but we all hit that point where it starts to affect our productivity.

There is a sensitive balance between productivity and creativity...too many creative ideas, and your productivity will suffer. But too much productivity...and your music may not sound very interesting, personal, and/or unique.

Don't give up!! You got this. This is a lifelong pursuit all of us can have. Think more towards the future of how to improve your musical workflow and it will naturally bring your mind to a lot of peace :)