You had it. Clear as glass. The solution. The connection nobody else saw. It arrived fully formed while you were driving, or showering, or falling asleep.  By the time you found a pen, it was gone. Not faded. Gone. Like it was never there.  Your brain generates brilliance it can't hold. The ideas aren't the problem. The storage is. 

If you'd like the scientific wording for this, let me know.