First of all:
I couldn't believe she said that so soon after myself and her step-dad messily split-up.
Why are you on the hunt for a new man if you only JUST split up with your last partner? Are you incapable of being alone for a while? Taking some time out to get yourself sorted out? From your post, it sounds like you need it...
On Tuesday I asked my DD (18) to watch my DS (5) while I go out on a blind date. She said no way as she was going down the pub with her girl friend (22) to watch the England game.
Very reasonable response from her. She's 18 years young, it's the summer, and she, like any other normal 18 year old, wants to make the most of it. She's the SISTER of YOUR son - he's NOT her responsibility! And, she already had plans. She had every right to say no to your request.
I said MY house MY rules!...I went BALLISTIC😡
Are you actually right in the head? So your logic is that because someone lives in your house, you are entitled to demand that they cancel their plans so they can provide childcare for you - so you can go meet some random man? That her living in your house gives you the right to hijack her life and time? You sound like a horrible mother, honestly. You can't stay single, you prioritise your own love life over your young daughter's social life, and...
My DS burst into tears.
...you have fights and confrontations with your older child in front of the younger child. You are mad.
Pay for childcare, like any other normal person, if going on this blind date is so important to you. It's not your daughter's responsibility to put HER life on hold so YOU can progress with yours.
she replied "you only had him to save your marriage and look at how that turned out"
I mean, it sounds like she might have a point...
I know it's been hard for her, but imagine how hard it's been for ME ??
No offence, but your life is a result of your own life choices - plus, YOU are the parent here. That means YOU make the sacrifices necessariy, not your children. YOU chose to have children. YOU are the mother. If you struggle with life, go talk to a therapist or even a good friend - but please don't make it your 18 year old's job to take care of you and put her life on hold for yours. It's not right or fair.
I took her phone and told her she can not go and see her girl friend.
Wow, mother of the year...you are not. This is unacceptable...
She was so angry and said she feels like she is always looking after DS and that its not fair for me to go and 'hook up' with 'random men' when she can't see her girl friend
So, from her perspective it's a habit of yours to pawn your son off on her so you can go out there and live your life. Do you acknowledge any of the feedback she's given you? Have you actually sat down and asked yourself if she might be right? That you are too wrapped up in your own dating life, to the point where it affects HER social life?
I'm not saying it was good of your daughter to disrespect and hurt you with her comments, but your most recent totally unreasonable behaviour has clearly been the last drop for her. You need to take a good look at yourself, step up as a mother, and stop expecting your daughter to provide childcare for her brother all the time. Who, by the way, probably also doesn't appreciate being passed on to other people all the time so you can go out.