Name changed for this.
I have a DD, 30 months. She has always been what would charitably be described as "high needs" but now she is just becoming unmanageable.
She has never slept through the night. On a good night, she might be up once and then provided she is given milk, she might go back to sleep. On a bad night, she can be up 3/4/5/6/7 times.
Last night, she woke up at 1am. I gave her some milk, which she drank. She then decided she wanted me to sleep in her room (for context - I never do this!). I told her I wasn't going to, because I was tired, and needed to go to bed. She then screamed/tantrummed from 1.30am - 3.30am. There was literally nothing I could do to placate her so after checking she didn't have a temperature, didn't have a wet/dirty nappy, and didn't need any more milk, I left her to it, checking regularly to make sure she was ok, and putting her back in her bed.
At 3.30am the neighbours banged on the wall 
I took her downstairs and she continued to scream hysterically, not sure why, but presumably because I wasn't sitting in her room with her. Eventually she calmed down and I took her back upstairs and put her in bed. She chatted to herself for a bit and then went to sleep.
This morning she woke up at 7am, miserable and cross. She then had a further tantrum of epic proportions, screaming and crying, refusing to get dressed.
In the end (after 45 minutes of trying to get her clothes on, her kicking, screaming and ripping them off) I had to go out to pick something up from the shops, so had to force her into the pushchair, in her pyjamas, sockless, shoeless and coatless. She screamed for a further 45 minutes. People were staring at us in the street.
I have been in tears twice today because I just can't cope with this any more. I have an older child too and it isn't fair on him, and I am failing at work because I am so tired I can't cope with that either. It is causing friction between me and DH.
She is supposed to have been referred to the behaviour clinic but no one has been in touch. I called them this morning and they said they would call me back - they haven't. I am so desperate and I don't know how I can get help.