What a painful question (not your fault at all, dear Samkim)... I was baptized Presbyterian in February 2004, and made elder of a local Presbyterian congregation in January 2005. I took Communion there many times and I, as an elder, also served Communion, saying, "body of Christ, broken for you.... blood of Christ, shed for you..." And I was taught to believe that Christ is somehow mysteriusly present in the church where the bread and the wine are served, but He is not in the bread and He is not in the wine (Calvin's exegesis). Then, when I was chrismated Orthodox this past February, I began to partake in the Holy Eucharist in an Orthodox Church and I began to believe, indeed, sincerely, that I am really, literally, taking the most precious and most holy Body and Blood of my Savior Jesus Christ in my mouth. The feeling was incredible and, like others said, impossible to describe. My entire life changed. Just this one mere thought - that next Sunday, I will be standing in church and taking the Holy Eucharist - made me examine myself most carefully, ruthlessly, with a much bigger scrutiny than I ever did before - and yet, I never felt a "burden," but, rather, felt happiness, a bliss... But now, it turns out that the church where I was taking the Eucharist is not really Orthodox and I might have NOT beein partaking in the real Body and Blood of Christ...