I've lost my sex drive

I have been married for 11 years. My husband is an agnostic but I am a committed, Christian. The problem is that I have completely lost my sex drive. I’m in my 40s and finished nine months of treatment for breast cancer a year ago (including a full mastectomy and a reconstructed breast which doesn’t look like the other!). Since then I find it very hard to get enthusiastic about sex and don’t feel at all sensual...