I have a toothache for three days until now, it feels numb and I got fever. What medicine should I take?

Toothache tx... You need to see the dentist ASAP - there is no substitute for this. In the interim, use of an NSAID to alleviate pain and inflammation - something like Ibuprofen or naproxyn. But these are only temporizing measures. A visit to the dentist is mandatory to deal with the source of the pain.
Infection. Appears you have an infection.. the numbness may be caused by pressure being placed on the nerves in that region. You need to see a dentist immediately for care. No medication will solve your problem.