The child's doctor can indeed be a good resource.
You might want to focus particularly on your child's developing ability to communicate. The aggression might be an expression of frustration.
If there is any delay in the ability to make himself understood, or frustration with self-expression, it could be helpful to help him communicate through some simple nonverbal signs, which you can invent yourself if you are able. You could also get some ideas from sign language.
Perhaps your baby is reaching the stubbornness of the "terrible twos" a little early. For this, what helps is to pick your battles, and try to lower the baby's frustration level, so that he has less to get angry or upset about.
If your baby is exposed to television, it might be helpful to limit or eliminate that.
Ask the doctor to look carefully at baby's skin. Skin discomfort, such as itching, can give a child a short fuse (i.e. make him irascible).
When baby bites, you can gently put the child's arm in the child's mouth and help him close his mouth on his own arm. You don't want him to really chomp down. You want it to hurt just enough that he realizes that his biting causes pain!