My husband had low sperm count

Good day papas and mamas pls help your sister o. My husband had low sperm count, his elder sister has fibroid and younger brother nothing was detected medically but no child. At first we thought its medical issues they were taking their drugs has directed by the doctor, i later told my mother what was going on and she took me to a program and the pastor said its my mother in law that was afflicting her children with the reasons best known to Her, that she will release them but it will still take some time. I didn't believe because my mother in law is a prophetess that has delivered more than 20 people who were TTC for more than 6 years and they now have thier children and also this woman can care for Africa that my mother and sister said i am luck to have one of the best mother in law. My problem now is that the pastor said i will go on fasting and prayer to remove my husband from the bondage and if i do it that mother in law will dislike me forever and even turn my husband and other family member against me. Pls should i joined others on the waiting list till this woman will release them or i do the fasting and prayer and face what's ever that follow. And also how would i convince hubby to stop wasting money on drugs because i don't want to tell him the secret behind his childlessness.