How do I survive this...

G seems so unhappy these days.  I think she is becoming more aware of the meds and says she doesn't like them and doesn't like how she feels.  She keeps blaming me for making her feel that way.  I'm at a loss.  She's always saying why does she have to go to school when her friend doesn't.  ( I really don't know what her friends family does and if they do or don't let their daughter stay home more than G.  She is in Kindergarten and G is in 1st Grade).  She wants to have a little sister and blames that on me too.  I wanted her to have a sibling but J didn't want to move forward.  He wanted so much for my age to be an issue and was so upset the Dr gave me the go ahead to try again.  Reality is, he didn't want another child and I'm being blamed by her for not having another.  I'm trying not to take it personally but it's hard when your child blames everything on you at such a young age.  She's not grateful for anything she has and I don't know how to get it through to her about that. With our trip to school today, I came home feeling lost and sad.  I don't know how to feel happy anymore.