I am also sorry for your loss, but hopefully can give you some hope. I also have MTHFR, I was diagnosed after losing two pregnancies. Despite my losses, I am now looking at my 3 month old son! There is hope. After my second loss and the diagnosis I started taking prenatal vitimans, extra folic acid (in the am and pm), and baby asprin. I also started drinking wheat grass daily, which doesnt taste good but is loaded with great nutrients.
Best wishes on your journey, stay positive.