Kay is right, it is probably an imbalance in your hormones. You may consider calling your gynecologist and telling him what is going on. You could also ask for a FSH, estrogen, and progesterone blood test to determine how much of each hormone you have. If you are low on hormones, they recommend you take some to get your numbers back up. I too go through this sometimes. I do hope that you are able to get to the bottom of this. It can be very frustration for you and your spouse. Good luck and please keep us updated on how you are doing. We will be here to support you any way we can.
this could be down to hormones changing or you may feel less womanley inside theres no reason to feel like this though, i look at it like how would a man feel if he lost a "thingy"