:I'm once again considering converting to Orthodoxy. One of the things that worries me to the most is being away from the sacraments for the catachumen period (about a year according to the priest). :
That was in fact one of the things that prevented me from converting to Catholicism (from Anglicanism). Two months without the sacraments and I was scurrying back to the Episcopal Church (which I now regret!).
I would like to disagree with the view that as a Catholic you should leave if you can't accept all "the papal dogmas." The exact nature of the papacy is still undergoing development, and you should make sure that what you are rejecting is really the permanent teaching of the Catholic Church and not just certain ways of putting it. You should also ask whether you, as a layperson, are really confident enough on this issue to leave the Church of your baptism, whose sacraments you do not doubt.
It seems clear to me that the early Church put a lot of importance on communion with Rome. We can argue about how much, but clearly it was important to them. Maybe the modern papal dogmas (presumably you are thinking of infallibility primarily?) are mistaken developments, but are you really so certain that the papacy is totally unnecessary? I can't see it, myself.
I think signing off on every detail of a church's teaching is not the most important thing. Keep an open and humble mind, receive the sacraments, focus on those things you are sure of. Most importantly, talk to a wise and holy _Catholic_ priest before making the jump. If you haven't done that, you should not be thinking of conversion.