Dealing with infirtility

My husband and I have been TTC for 4 years. I have Endometriosis. We are only 27. My doctor has me on Letrizole (generic to clomid) and nothing seems to be working. I just need reassurance or kind words of hope or something. I am becoming so depressed to the point I don't want to have intercourse, or watch a show/movie if it has anything to do with having a baby, and avoiding getting anything from the store that makes me go near the baby section. It has even come to the point where I have thought of divorce so my husband could have a happy healthy family. Help please.