Dealing with a moody mum?

My mum has been having a bad time lately and thought she may need a hysterectomy. She went to the hospital and they've referred her to have key hole surgery or something. Anyway, since this all started she's been taking her emotions out on anybody near by, which is usually me. She wakes up with me when im getting ready for college to tell me about all the things i don't do around the house and how im going to be late, when in reality i would be on time if she wasn't having a go at me. Now im into my summer break, i've been spending most of my time with my boyfriend because i know my mum will find something to moan about if im at home, but it's as if she doesn't want me to go out. She's always been strict with me and that's fine, but now shes setting me curfews 14 year old's would have. When im around the house, she moans or ignores me like she doesn't want me there, but at the same time she does everything in her power to make me stay. I took a pot of change that had been collecting for years to have it sorted and made over �200, so i divided it up to buy a provisional drivers licence, save about a hundred and get my hair trimmed and coloured at a fancy salon because i've never had enough money spare to do that. When i came back after having it styled all she did was ask how much it cost and continue to tell me how pointless it was. It really got on my nerves because she has a pair of �200 shoes in her wardrobe that she doesn't even wear, but God forbid i do somthing nice for myself. My dads no help because if she doesn't take it out on me, she'll take it out on him so he keeps his head down and caters to her. Im just feeling really annoyed right now because she never seems to notice all the things i do. I get really good grades and ive never been in any trouble, but i've broken curfew a couple times (once to see my grandad) and it was like id robbed a bank. I don't know what to do with myself....am i being sensitive or is she being unreasonable?