Can't cope with dd behaviour

[CBradshaw]

My dd (11) has always struggled to cope with big emotions and becomes angry very quickly. Recently, during the holidays, it's got really bad.
She will fly off the handle at the smallest thing, so I can't even try and stop triggers. She ends up trying to physically fight or hurt me, slams doors, stomps feet, all while constantly screaming at the top of her voice "you f*ing st, you fing b*ch". These 'episodes' can last over an hour.
We live in a terraced house and I don't know how long it will be before they call the police. I have spoken to them before and they seem understanding, but I can often hear their conversations through the wall, so they must hear the swearing. They have a toddler and I'm worried he will start copying her words.

I'm a single parent, and although she (and her younger sister) see her Dad often, he is no help (I left him due to emotional abuse and his anger issues).
I've been in contact with Cahms and social services and they were completely useless.
Any consequences or punishments just end up causing bigger tantrums.
I'm at a complete loss of what to do.

@CBradshaw is she already in High School or is she just about to start?

How is she at school? Do you think she could have ASD or ADHD? What sort of things does she fly off the handle over? Does she regret her behaviour afterwards?

She is just about to start secondary school (she is looking forward to it).

I don't think she has ASD or ADHD. She just struggles with anger. Sometimes the outbursts will start over the smallest things. I don't mind her getting angry, it's the behaviour she displays when she is.

I don't think she regrets it, but I think she is embarrassed - as trying to talk to her about what happened after she has calmed down, often turns into another meltdown.