I can relate to that!
(My mother often said, “Somehow, I’ve lost the thread of what I was going to say...”)
That's never a problem for me. I don't let the current discussion limit my contribution, if that's what it is.
Or let me put it this way; my brain operates so quickly, when I'm doing really heavy thinking, it's from the mass gain because my thoughts are approaching the speed of light.
(That's a joke, of course. My thoughts are not limited to light speed.)