My husband and I have grappled with this one, too.  We tried the traditional bread, which in our church is a tiny amount, and juice.  I got sick and felt lousy for a couple of days and he didn't handle it well, either.  To be honest with you, we have prayed over this question and we no longer take the elements.  We still feel like we participate because for me the focus is on  remembering the sacrifice that was made for us.  So, I am participating in my heart and I feel like God understands my sensitivities and allergies and knows the itentions of my heart.