Reddit reviews Biting & Aggression: How to Solve Problem Behavior with Clicker Training. The Bird School for Parrots and Other Birds
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Honestly this may not be due to you going away, but rather to him coming into sexual maturity. He is the right age for it, and during that time they tend to go from cuddly babies to adults that want to defend their territory.
But why this behaviour exists doesn't help you get past it! I would look into buying some behaviour training books and working one on one with him to positively reinforce the good behaviours while trying to get him to let go of his old ones. Consistent and patient socialisation should be able to return him to the bird he was before (or at least an adult, slightly more independent version of his baby self).
Here are a few good books I've found:
Breaking bad habits in parrots
Biting and aggression - clicker training (clicker training is awesome, they use it to train most zoo and top performance domestic animals! If a dolphin can learn it so can your parrot!)