Just been referred - terrified

We've just been referred for IVF, and I'm really scared. The success rate for women in my age group is about 30%, but I know that with my endo and adenomyosis it could be as low as 10%, and if we are successful the chance of a miscarriage is high. I do really badly on hormones - I've never been able to stay on any pill I've tried more than a couple of months because it gives me unbearable mood swings. I'm really worried I could be putting myself through a lot of physical and emotional heartache for nothing.