Help Needed

Hi. I have been married for the last 13 years. I cringe every time my husbands suggests or tries to have have sex with me. I don't know what is wrong with me. I really need help. This does not happens sometimes but happens all the time. I have never been in any abusive relationship and I know I love my husband but just the thought of him touching me makes me cringe. I most of the time just let him do as he pleases but I never enjoy it! I do not react to his touch as in my mind I zone off so that I don't know what is happening. I sometimes cry afterwards and other times I throw up without him knowing. He seems to enjoy sex so much that he most of the time has to do it daily. This sometimes makes me sick and I can actually feel my head throbbing just thinking about him wanting sex tonight! This does not put him off though and wouldn't put him off too the next day knowing that I am not enjoying this. I don't like to be touched by him in any way at all. I sometimes would like for him to hold my hand in public but he doesn't do this as he thinks it's stupid! Our culture does not give the kind of help that can get me to see a specilised doctor for help nor can I talk about it to anyone as it would be tabboo to talk about a husband in the same way you would talk about a boyfriend to a girlfriend!! Please help me! I decided to go on the net and find groups that may be able to help me talk about my problem. Pliz Help!