Yah, thats totaly normal.

Normal its your bodies way of trying to get pregnant (evolution)

3 or 4 days before i get my period i want my husband all the time. we have 8 kids now.

Even for someone not married its not normal from the a physiological point of view. Sounds like you may have hormonal over-firing. Do you also get acne or oily skin and scalp around this time? It may be excess androgen. I suggest that you try kefir and spirulina to even it off. They have a beautiful symbiosis where they can balance your hormones out to prevent them from over firing at once. They have a hormone regulatory effect plus they are natural food. Its definitely hormonal and may interfere with your emotions and make you feel doing something you may regret. Lord knows I have seen this happen many times. As an woman, I suggest you get one of those purple Philips ergonomic vibrators that can travel with you. Its not physiologically normal because it takes over your normal function but its not psychologically abnormal. I suggest you celebrate your womanhood sensually and get yourself off right away with the Philips instead of working to build up the eroticism in your mind and getting yourself all worried and mentally worked up where it can play with your emotions. After you release the pitocin from say 2-4 orgasms you'll be fine. I truly suggest the Kefir and spirulina. Google it. it has done wonders for people I have recomended it too. Women's hormonal landscape balances out. Those without libido get them and those with too much, have theirs subside to manageable levels. Normally I would tell people (I counsel young Christians) that this is not a bad thing in itself if you think you are able to control it. If you get relief from the private things that you do, it would suit you well for now. But what I am alarmed about most of the time is when those highly-sexed feelings eclipse the time they like some person they are not yet sure about. You will decieve yourself and them into a false and fleeting feeling. I have nothing against masturbation and I keep telling young adults about that. I get all worked up when it becomes mistaken as part of a false emotion.