How can I stay faithful despite feeling discouraged?

When I was not married, my sister in law had left her monthly period dirt and panty in bathroom as I was getting late for college, I had to wash all. Later when I finished taking bath she came to check if I washed it or not. After this incident my life is very difficult, most of the people hate me, there is no progress in my religious as well as worldly life. I do wudhu but cannot perform my salah. I do not have baby after 12 years of marriage. Some people tell me it was black magic by my sister in law.
Please suggest me I have read many religious books and gone for taleems as well as I want to believe good or bad comes. The continuous downfall in life is making me to believe my sister in laws bad deed is stronger. How do I make my belief stronger that I perform my salah, I am staying alone in foreign country with my husband, nobody speaks to me, alone whole day since 12 years, I start my salah than I am demoralized same lonely environment and hatred from everybody.