I already asked the therapist, but I've no idea if hey will answer..

This probably sounds like a rant, but my Chinese mother had a very hard childhood (divorce, beatings, poverty). Now, she is over protecting me. Piano lessons because she wanted them herself, a 7:00 curfew and 10:00 bedtime, monitoring how much water I drink, not letting me chose when, what or how much I eat, trying to bribe me with ice-cream to finish a second plate of vegetables when I was uncomfortably full already (yes, really). At one point I was going pro-ana, just to have a tiny bit of control, but she never noticed, and I stopped, with help from a friend.
I've never done drugs, smoked, drank alchohol, skipped school, gone out late, gone to a party or even kissed a guy, and I don't have many friends.
It’s really frustrating. She also goes the other way, taking out her anger on me, as though it was my fault she stayed with my dad, or leaving me alone to deal with certain issues.
She also expects me to get good grades and remember everything, because of my 144IQ. My grades a really bad though. All mistakes are then 'on purpose, to annoy her'. Even when I get a cold, she acts like it's my fault, done to make her life harder.
I don't know what to do. I used to reason, then argue with her, but it didn't work in any way. Now, I stay quiet. It's lead to some SI, but nothing bad yet. The worst is that there are really great times, followed by awful lows, triggered by stress/pain/anger/helplessness on her part?
Next year this time, I'll be leaving for college. I'm scared that I won't be able to be independent. She never even lets me ask questions to a doctor myself, how am I going to deal with credit cards and applications? She's already decided my career! (Interpreter at the UN, like it's sure I'll be accepted)
We've gone to a psychologist before, when she was thinking of divorce, but now she refuses.

I've no idea what to do??? (btw, thanks if youve read it all ^^ I know, its long :s)