It doesn’t matter how your husband feels about the Catholic Church. If he, as a Catholic, married you in a civil ceremony thirty years ago, then that marriage would automatically be invalid in the eyes of the Catholic Church. Any marriage attempted by a Catholic outside of the Church is invalid by that fact. You do need the diocesan marriage tribunal to objectively confirm that this is the case. Then you will be free to become a Catholic. I’m surprised that your priest didn’t catch this. We priests do get overwhelmed sometimes.
Fr. Vincent Serpa, O.P.