ATHANASIAN CREED
"The Father uncreated, the Son uncreated, and the Holy Spirit uncreated."
Jesus Christ is the uncreated Word of God in His Divinity...
It's important to understand Athanasius and the entire Nicean council didn't meet to discuss whether the Logos was created or not. They met to discuss what the Logos was made of. Until the time of Arius, they had no problem saying the Logos was created, born, generated, birthed, begotten, etc. All early church fathers understood the context of the Word's creation - namely He was literally begotten of God the Father before time. As kind begets its own kind, God begets God. Prior to being begotten, the Logos (and Wisdom, the Holy Spirit) were within the Father as His Reason and Wisdom. So they always existed within the Father, and then were birthed in eternity past as His only begotten Son. So they always existed, but there was a specific "time" in eternity that they were begotten - they were "brought forth."
But Arius was now claiming the Logos was not begotten from the Father's bosom, but was created out of nothing, and that there was a time where He did not exist. He was hardly taken seriously until his teaching began to spread. Once a threat, this teaching created massive division within the church. Constantine then calls the council together in an effort to unite the church. They agree that the Son was not made from nothing, but made from the very essence of the Father, which makes the Son eternally existent. Again, no argument as to whether the Son was born of the Father ever took place. The creed - crafted from earlier church father's teachings - dealt with the Son's substance, not His creation other than to say He was created from "Very God."
From here, Athanasius began to be very careful with the word created, and since that time, a new theology of "eternally begotten" began - especially promoted by Augustine, and later Western theology in general. It's a small shift, but a shift nonetheless - one that very nearly promotes three gods.
So your answer on where the Holy Spirit comes from depends on how far you want to go back. I choose to listen to the earliest of church fathers as they interpret the Scriptures. Irenaeus, Tertullian, Justin, Theophilus, Tatian, Hippolytus are all clear and agree with each other. The Word and Wisdom (Son and Spirit) were existent within the Father, and begotten as One. Both derive their existence from the Father, though you can correctly argue that, like Eve came from Adam, the Spirit was brought forth from the begotten Son, though at no point was the Father, Son or Spirit ever separated in essence.