"You aren't denying eternal preexistence with that statement are you? Using "origin" sounds like beginning. God has no beginning."
No. The Holy Spirit proceeds from the Father as the Creed states. There was never a "time" when the Holy Spirit didn't "exist". Actually, using a word like "pre-existence" is not appropriate when speaking of God Who created existence, though I understand what you mean. We are constrained by our own existence and language to speak of God the best we can. Orthodoxy often finds its easier to say what God is not rather than what He "is".
I didn't think you were, but needed that re-affirmed.