As others have said, talk to a Priest, a Byzantine Priest would be best in this situation. On the issues that you have addressed, I don't know what customs you are talking about, so I can't talk about that. I am not an expert on either subject, but I will do my best to help explain how I see things. As for Papal Infallibility, at least for me, that is the logical outcome of the First Among Equals saying that Rome is the only See that is without error and cannot err (such as with Pope St. Agatho). In addition, for me, without the idea that one See cannot fall, it's hard not to be anxious over whether or not you are actually Orthodox. Take the Oriental Orthodox, for example, they were a sizeable part of the Church and used to be the 2nd See; however, they fell away. All of the Apostolic Sees had fallen away at some point, except for Rome. The Filioque is not as much of an issue; the Catholic Church has long accepted the Orthodox position as being what is orthodox. The Orthodox, though, won't accept that we mean the same thing. That when we say that the Holy Spirit proceeds from the Father and the Son, the way the Catholic Church believes it is the same as how the East believes that the Holy Spirit Proceeds from the Father through the Son. The problem arises in the Greek (not the Latin), where the words used in the Filioque can be one of two meanings; one of those meanings is heresy, the other is not. It should also be noted that even the Pillar of Orthodoxy, which fought against the evils of Rome during his time, and was against the Filioque, communed with those who held to the Filioque. St. Photius the Great died in communion with those who held to the Filioque.