It is difficult when you are not allowed to see someone you like a lot. It is normal that you think about her since this moment and that you miss her.
Because you have been friends with your best friend since kindergarten, it is difficult to know if you are really attracted by her or if you like her a lot as a friend. It is not easy to know clearly what our feelings means, but it can be positive for your friendship to talk to her about it. You cannot talk to her by phone, but can you send her an email, or post her a letter ?
If you don’t want to talk to your best friend about your feelings, maybe you can talk to someone else that you trust because you will feel you are not alone with your problem. It can be a member of your family (sister, aunt, grandmother) or another friend.
I don’t know why a huge fight between your two families happened, but maybe you can talk to your parents about this forbidden relationship (without saying a word about your feelings for her, if you dont want it). Give news to AlterHeros if you want or need it,