Interesting stuff about weak core muscles and nervous disposition. Interestingly in this context when my curve doubled in size during that time period I started getting really terrible troubles with anxiety even though at the time I was unaware that my back was getting worse. I only found out at the end of the year that the curve had worsened.
OP just think carefully before your meeting with the expert and come up with a list of all the questions you have. Take it with you and ask him all those questions. Its also worth getting a second opinion if possible, some consultants will be more pro surgery and some will be less. There are a lot of unknowns with scoliosis so be aware of that.
If your curve is less than 40 though I don't think surgery would be a good idea. If the operation goes wrong, which although it rarely does it still happens, the consequences are awful. In my operation the surgeon started to trying to wake me up during the op because my legs weren't responding, fortunately after a while they did, but it was obviously very worrying for the surgeon and just goes to show that things can go wrong. [But only very rarely so dont worry if you do have to have an op.]
Basically just read what samtheman put because its all correct.