You do have alot on your plate, and i feel for you.You are sounding alot like my daughter.
Keep your chin up. What we go through now ( the Hard and good moments), can only make us stronger later.
As for your friend, I am thinking she needs a "friend". Be there for her.
Hope your daughter feels better soon. Impetigo can really hurt.
I gotta run, I just got home from work, and I am going to take my grandson out to eat. I live 4 hours away from him, and he is staying with me till Sunday. I am off the next 5 days, going to the movies to see "Transformers", and to Raytown's WaterPark.
Oh, and I am managing with my pain, all legally,and what is prescribed to me. 
Take Care& Bless you......