First of all, you guys are freaking jlerms out. Stop snapping at each other.
Juliana, (BTW, welcome, I see your new here), from personal experience of having several friends who have married outside of Orthodoxy, I was rather surprised at your spiritual father saying. Considering Orthodoxy does allow Orthodox to marry non-Orthodox (there are some rules involving what branch of Christianity they are in, etc, but it is allowed, at least in the Russian church) IN THE CHURCH, in an ORTHODOX CEREMONY, I do not see why you would be forbidden to partake in the Holy Gifts only a few times a year.
I see however that you wrote that your husband is not Christian. This is of course a different situation. However, your marriage to him was before you embraced Orthodoxy, and (strictly on a personal level), I do not believe you should be punished for embracing this faith while your husband does not. In fact, I think you should be commended, as many people interested in Orthodoxy are held back by what their spouses think, say, do.
Besides that, think of how many early Christians were married to pagans when they converted, many of them went on to become martyrs or other kinds of saints, and I highly doubt they were forbidden Communion on account of being married to pagans.
I do know 2 women who are married to non-Christians, 1 is married to an atheist, 1 is married to a Hindu. Both attend church regularly and receive Communion frequently.
It is a sticky situation, as your spiritual father has already told you what to do, however, I would research it (try early Christian saints, see if there are any modern writings on the subject, I'm sure there's something) before talking to him, and maybe you'll be able to reach a more agreeable situation.
Ok, that's my 2 cents, hope it makes sense.