I have the exact same problem, except I had some pretty bad tearing and a significant lost of blood with my delivery. THANK GOD I had an epidural.
Anyway, I went to my MD for this problem, and he sent me home with a written *so that my husband would believe me* to have sex at least three times a week using astroglide instead of KY. He told me that KY is good, but astroglide is like WD-40 when it comes to intercourse. He did say that the perscription was just a guideline. He explained to me that basically I had some scar tissue that is really tight, and I need something that is constant that will help it get back to normal. My husband I dont have to have full blown sex three times a week, but I have to have some type of penetration action down there for at least 5-10 minutes... to help stretch the tissues as well as break that mental block of it being painful causing muscle guarding, which could also contribute to the pain. My MD even put on the perscription that it is advised that I get a toy for when my husband is away, as well as for if we decided not to have intercourse.
SO!! My advice... go to your MD and make sure there is nothing seriously wrong. I'm sure everything is just fine, and your MD might give you the same advice mine gave me. You can also take my advice and try it for a little while. I actually have an appointment next week to see how it helped, or if it didn't help. In my experience, I had days where it would hurt more than others, but I am hoping things got better.
I hope things get better for you too!