What have I done wrong?

My husband told me yesterday that he would help my friend Krista move today.  Well, Krista called me this morning and said that she and her dad have done as much as they can but she pulled her back trying to lift her sectional couch and asked if he would come help.  I told her that he had said yesterday that he would.  So, I went to wake him up and he started griping at me.  He said that he would help when he woke up, not when he WAS woke up.  I told him that she just needed a little help and that she already had most of it done.  I don't feel good today, my back is hurting really bad, and usually when I don't feel good, I tend to cling to him and want to be held.  He knows this.  I am so extremely in love with him.  So, you can imagine my shock when he told me that he has been mad at me for over a year and that the last year of our marriage has been hell for him.  I told him that I go out of my way to keep him from getting upset and he said that I could have fooled him.  I understand that I have anxiety disorders and I tend to go to extremes with my worry.  I am constantly afraid that he is mad at me even when he says he isn't.  I constantly ask him if he is mad at me.  He understands that it is my anxiety and that I am OCD too.  So, why all of a sudden does he tell me this.  I started crying and getting upset and he told me to dry it up and get in the house.  What have I done wrong?  He says that I don't listen to him.  Or rather, he says I listen but I don't hear him.  I try my best!!  But, I am not perfect no matter how hard I try to be!!  I just don't know what to do.  I am so scared that I will lose him.  I love him so much and I cannot live without him.  He is my only true love.  My children love their Daddy so much.  And, we have always got along great!!  We rarely ever argue and when we do it is about money problems or a difference in agreement about discipline or something.  But, we never have problems like this.  He has never made it sound like he was utterly unhappy with me!!  What have I done?  Have I screwed up our marriage??  I can't handle this... I will die without him.  I'm just so depressed and I don't know what to do....