I know how you feel. I have a really irritating "friend" where everything revolves around her.
One time my family got food poisoning from this resturaunt (I didn't get it because I was at my HS football game) and I ended up having to give them gatorade and made sure that they were okay.
She sent me a text and said "Hey, want to hang out?". Usually her idead of "hanging out" is me watching her go on facebook and looking up retarded books. Anyways, I texted her back saying "My family is sick". She answered with "So... you can't hang out?" I was soooo annoyed. Like I was going to leave my sick family just to watch her play on the freakin' computer.
I didn't answer because I was afraid I was going to text something I would regret later. Then what does she do? She invited herself over to my house when my family is throwing up and having frequent trips to the bathroom from the food poisoning. Ugh. Feel free to talk to me because I know what it's like to have irritating "friends".