You are a nursing mother? Then I have this question for you: why are you fasting? Nursing mothers are exempt from the fast! I agree with Sloga: Be gentle with yourself. In conjunction with your spiritual father, just try to do the best you can.
I know what you mean about being alone. I've been in situations where I was the only Orthodox Christian for hundreds of miles around, literally! It's rough. Make whatever use you can of the internet to find other Orthodox families. I know that some have posted on the special family board they have on this site now. I think it's important that you realize that you are not alone and that you make an effort to search out others like you, and ask God to connect them to you!
It's seldom an easy ride as a convert. You are going through things that many of us have gone through. Just keep asking God to help you: Don't stop asking him for help at all times. That's one thing that I realize our "rugged individualist" western culture doesn't teach us to do, and that's to always call on the Lord for help. If you need better spiritual advice, ask him for it, and it will come. If you need relief from certain warfares you will get what you need. Keep an open heart to Him and ask Him if you are missing something, and if you are, could He please show you what! He will answer. Don't despair if you go through periods of real spiritual dryness. This is normal: we all go through it. God will not abandon you, even though it feels like it.
But who am I to give you advice? You have to cope with way more in your life than I do in mine, and I am no spiritual guide. I admire you and your husband for your perseverance.
May God bless you in your struggles and grant you your heart's desire!
BTW, it couldn't hurt to post a prayer request on this forum.....