This will be a man's perspective - raher than telling what you should do, I will attempt to provide some feel for how it may look from the other side, to help you consider how to address the situation, based on your particulars.
As a man for whom oral sex is a significant part of sex life, I found myself in a situation you describe. My wife never told me she didn't like oral sex until some time after we were married.
It should perhaps be noted that it turned out she doesn't like either giving or receiving it -- as I was more than happy to give her the same kind of pleasure I received. Broadly for the same reasons -- she considered it "dirty" and "disgusting".
Of course, I respect her dislike, so we don't have it anymore.
However, I did and do feel hurt about her not being straight about it from the beginning, and I did feel that she concealed her dislike until our relationship was firmly anchored.
Plus, of course, here was she telling me that I had inadvertedly been causing her significant discomfort during parts of what should have been an enjoyable and most intimate times for both of us.
I thought for some time about why was I particularly aggravated about this, and beside the reasons mentioned I came up with something that might possibly explain it not only for me, but for some others, too.
It appears that for me either giving or receiving oral sex shows the total acceptance of other's body -- it is as close as you can feel and say "i love you" with sex, as possible.
Therefore to withhold it and to dislike receiving it either, feels like the partner neither wishes to say nor to hear "i love you" during sex.
It is of course not about reality of loving or not somebody -- it is about how some things or lack of them feel.
I was not always eager to give oral pleasure either, but when I understood that no part of a body is "dirtier" than other -- provided hygiene is maintained, of course -- and that giving my partner pleasure really excites me -- that removed any reservations I had about it.
You have every right (and you should) to refuse doing what makes you feel bad in sex. If you don't, it would, apart from other things, raise your stress and possibly make you feel resentful at your husband -- without actually being able to blame him for anything,as you haven't told him what you dislike.
At the same time I encourage you to consider seriously the reasons you have for feeling the way you do -- not in order to do what you don't want, but in order to see whether maybe some things seem to feel differently when you take time to think about them from a different angle.