V.T.
I think you should stick it out. I know it sucks and he is awful, but if you give it back now, you are saying that he gets what he wants if he throws a tantrum. When he crys and throws a tantrum you continue to give him attention. Try just walking away when he starts. He'll cry, but after a few nights he will understand that the tantrum causes you to leave and it should stop. My sister has a 3 days of hell rule. Anytime she tried something new or took something away, she had three days of hell. They would scream, cry, yell, etc. She ignored it completely. She wouldn't even comment on the bad behavior. Within 3 days, most of the behavior stopped.