Having No Sex Drive!

I use to LOVE sex to the point my partner got sick of it haha
But after having my daughter, it's painful like really sore and doesn't feel right no matter what position and I don't know why, my gp said it's in my head, but it's not it actually hurts to the point of tears, and it's now causing fights between me and OH.
Any one experienced this and how did u fix it?!?!