GettinTrimmer You weren't over-invested. I know someone suggested that of you in the first thread, but I was reading the threads from the beginning, and you weren't. You were just trying to help your DS.
That's just a typical MN-style response which would have killed the threads months ago, if it hadn't stopped to be replaced by something much better.
Since then, the threads have settled into a significantly more supportive and respectful pattern. Generally, its recognised that we are all doing our best, just as you were then (and still are now).
I might be remembering this wrong, but you have a degree in something like English Lit? And what you wanted to do was read the 3 GCSE set texts so that you could help your DC? Good on you! I'd have done the same, if I'd have thought I could have helped DS.
I later did the equivalent: I've got a degree in maths and I'm good on spreadsheets, so I used my skills to devise a dynamic revision timetable and helped DS whenever he got stuck.
I think you took a break from the threads for a while, but I'm glad you've come back and I hope you aren't made to feel that way again.