Hands and feet pain bilateral, finger twitching. ana positive (80), high b12 vitamin, emg positive on hand, mri negative. what can be this disease?

Talk to neurologist: It seems that you already see a neurologist who has ordered all these tests. He/she will be in best position to explain the meaning of these tests in view of your history and examination findings. Tests are only a tool to arrive at a hopefully correct diagnosis. If not happy with current then see a different neuro-physician.