My fiance gets upset with me because of my 'tone'?

Anonymous
My fiancé gets deeply upset with me because she 'detects' annoyance in my 'tone' and doesn't like it. Most of the time she is wrong and I'm perfectly happy with her but she doesn't Beleive me. Sometimes it happens if I'm tired and my voice goes a little croaky.

I do not say anything negative or against her and my actions are fully supportive of her. I try my best not to react when she gets like this but it's so frustrating and she normally ends up having a go at me. It starts with awful looks as if I've been really mean to her and then the could shoulder and probably some confrontation... All the time I'm unaware of what is going on because I was never upset with her.

When I talk to her about it and tell her nothing is wrong she insists that she knows I'm annoyed. We're getting married very soon so in trying to not talk about it in the risk of her getting upset, but it does worry me that I'm helpless to stop this happening over and over. I've asked if there's something underlying that is upsetting her but she insists not. When I ask her to explain what is upsetting her she starts with my 'tone' (usually one or 2 words) and then draws some rather far fetched and elaborate conclusions from it that result in her believing I am angry with her.

I have completely adapted my life for her, I spend all my time thinking of her, doing things for her and trying to spend time with her. I have made far more sacrifices for her than the average guy, and she does appreciate that to some degree, but at the same time, she still does this to me on the tiniest of things, despite me always managing to bite my tongue when I am upset.

What do I do?

Please no "you shouldn't get married" responses - were deeply in love and our relationship is far better than most. This is a small issue in the grand scheme of things.
Updates
+1 y
Thanks for all the answers. Yes she is sensitive but she is also pure of heart and not the type to try to get me whipped. We do talk about the issues just a little later when we have had time to think. Voices never get raised and it's always sorted out. It happened after the engagement and I think it is maybe daunting for her too.
My fiance gets upset with me because of my 'tone'?
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