What should i do about this feeling?

Your age may factor in this, as well as the years you have been married. From my point of view, it would seem that your body is trying to tell you that it's ready for a baby! Your mind however is evovled so it's only seeing it as you want sex. After you have sex, your body relaxes because it feels it's going to be pregnant. When the signal isn't there, it restarts the sex craving for an other chance to get pregnant.