Try not to think of it as "anger" - this is a human emotion that snakes don't feel.
It's fear. Your little one doesn't yet realise that you're safe and that it's ok for you to be near him or pick him up. He thinks that you're going to hurt him, so he bites you.
The only way round this is to behave calmly and kindly towards him all the time, so that eventually he understands that you're really OK. Sometimes this can take weeks, sometimes months - they learn at different rates, so there are no guarantees.
But please understand that he is not "angry" with you. He's afraid. He's a scared little baby who needs you to be very gentle and patient.
As for sleeping three nights in a row - well, Corns stay hidden most of the time, but they especially like to hide away while they're digesting. It's pretty normal not to see a Corn for three days after feeding time.