To answer your last question in there, yes, this would be the kind of thing you can and should approach your priest about; it doesn't have to be during confession per se, but certainly in a private conversation. He will be able and willing to help you (I hope!).
Generally, the Fasting that you're doing is not only a self-sacrifice and a means of growing stronger in your faith, but it can indeed be an excuse for others to ridicule the faith or push away. The only two weapons against this are prayer (which is an integral part of fasting) and education: it is important that people understand all the reasons why we fast, not just one reason, or a justification that they've made in their own mind (a sort-of "internal straw man"). Continue to pray, and pray earnestly, for your husband, and in the mean-time learn as much as you can about the practice of fasting and the historical and theological reasons for it - through greater understanding maybe he will be more open to it, and through greater knowledge you will be more enriched by it.
I hope this helps, and that you find OC.net a welcoming and insightful place.