MMJ - I think I can understand that; if you are self conscious in yourself, you're going to be that way with everyone, including your husband.
What I would do in your situation OP, is the steps that are recommended in relationships where the sex has just faded away, but concentrate on yourself if you see what I mean. If you can't feel relaxed sexually when you are alone with yourself, then you have no chance of chilling out and enjoying sex with another person.
Now, I am only going by memory here, so apologies if my suggestions seem a little trite or daft. But as far as I understand, you need to become comfortable with your body before progressing onto anything sexual, and take it very slowly. So, first start by getting in the habit of being good to yourself, nice long baths with scented oils or whatever you like, read a book you enjoy, eat the food you enjoy. Love yourself in other, non sexual ways. Then slowly experiment with giving yourself massages perhaps when putting on a nice body lotion after aforementioned lovely long bath. Don't concentrate on sexy areas, just enjoy the feel of your skin and take some time to appreciate the body you're in. If there are bits you don't like, fine, but find things you like about yourself and pay attention to them too. After you've spent however much time just doing these things on a regular basic you can start to explore your body in other ways - with no pressure. It's all about the journey as another poster said, so just give yourself a nice massage and progress to whatever feels good.
If you really do have trouble switching off the logical voice in your head, you might have to do these things for a while before you have any joy. But do persevere and give yourself some lovin' even if it doesn't start out sexual. Basically orgasm is when the logical mind is completely shut out, so you might also want to work on telling the bit of you that says 'This must look well daft' to shut up and come back later.
I'm sure if you give yourself the time and remove all pressure to 'perform', you will get there. And it will be wonderful when you do