hi, if you have not got it solved, then try to restore the iPhone, as i am sure before this problem your computer must have backed up the data on your iPhone, and once its restored you can choose your existing profile (do not choose new iPhone profile) from the drop down menu, pin which there would be date and name of the phones you recently connected and synced with your iTunes. normally all your data when it was last synced would come back without any problem, the only thing you will loose is your data after it stopped syncing to your iTunes. alternatively to save that data you can first sync your profile on the iCloud. there it will back up your phone data without needing to connect to any computer, and then you can safely restore your phone, and follow the basic steps to restore your newly restored and updated phone to your previous profile and data.
hope this helps.