Have you discussed it with your mum? from waht you have wrote in 1st post, it seems like she doesn't know much about what is brewing in your mind. As for moving to other country I wouldn't recomend that since if it would have made her happy, she would have moved close to your uncle & other relatives when you were still a child. Don't take me wrong, some times distance between the relations take the petty issues out of the equation and the moment you start interacting more closely they re-emerge.
I would say talk to your mother and ask what she wants. Your uncle didn't say a definite yes to you, so if I were you I would take it as a no, as a reluctant "yes" is as good as a "no".
Moving to a new place half way across the world with your mum and starting from fresh is not as easy as it sounds, and you may end up in worse situation than this.
Also you didn't mention what sort of help you are looking for? Broadening your social circle and meeting new people may have a positive impact on both you and your mother.