Ttc has driven me crazy hbu?

3 yrs ttc. How can a couple keep their sanity? I dont understand why its been so hard to get pregnant when i had 3 healthy full term pregnancies. I lost my oldest two to my mother when i was younger with no hope of getting them back. She lied to dcf and they took my kids. I was only 20. Two beautiful girls. My husband who is the father to all my children well we both want to start fresh. We have a 3 yr old son but want to get over our losses and want to extend our family. It shouldnt be this hard to conceive. Its not fair. If theres a god hes very UNFAIR. HE WONT GIVE US OUR GIRLS BACK NOR WILL HE LET US CONCEIVE. WHATS THE POINT OF HAVING SEX? Im beyond pissed and frustrated. All this charting isnt helping either