Low libido

I have zero sex drive. Having sex in my 6 1/2 year marriage has become a chore to me. We have a 3 year old and I work full time. I've consulted my doctor about it. Blood levels were normal. They said oh you should try more foreplay. Honestly I'm not even interested in that. He masturbates probably everyday and it makes me feel inadequate. I have tried supplements and topical creams to aid in getting me in the mood but nothing helps. Any advice from those who have experienced this and have found something that works?