RP- Sudden aggression in my 4.5 year old

jw87

I posted this on the SAHM board too, any advice welcome!

We're a timeout/talk it out/redirect family... DS has already went through the biting/hitting phase when he was much, much younger, and he knows it's wrong now, and a few months ago he wouldn't dare hit me or anyone else, now all the sudden he's hitting me, threatening to hit me and hitting himself. 

It's freaking me out.

Anyone experienced this?  

He's smart, and he does this when I take a toy away or he has to sit in timeout.  Sometimes if I can't fix a toy he's broken, etc. 

I honestly feel like I'm being abused by him daily- physically and verbally- "I hate you.  You're not my family anymore." Etc.  

I really don't know where this all came from.  Any advice welcome.