I'm fairly new at this, so I don't have any advice, but I'm not new to the feeling of being 'picked on' by your spouse. My H does the same - since when we were dating, he would constantly correct my Finnish - to the point that it embarressed everyone we were with. At the time, I thought it kind of cute and him trying to be helpful, but even though I do make mistakes, I speak fluently now (I teach in Finnish all day!), and H still refuses to speak Finnish with me, since I 'speak so poorly'. He has been known to correct my English as well If it's not that, it's the way I clean house...little things so that by the end of the day I end up feeling drained. And like you, I don't really feel much like being with my H.
My hope, in finding this place, is to work on myself. To regain some of my own strength, and maybe that way to get H to stop pushing me away.
I can't imagine having the added problem of a chronic illness, and my heart goes out to you and others here dealing with that.
But I did want to let you know that your venting did some good - I've been feeling pretty stressed today, and it was good to read that I'm not alone.