What an incredibly tough situation to be in. I'm sorry you're going through all of this.
I would have hoped for a more human response in the first instance, yes, but some people don't know how to respond. It's ok to be disappointed and upset about it. Don't let that mess up what happens next though.
Looking forward to this meeting and getting a good outcome for yourself, I hope you don't mind me observing that you seem to be deploying quite a passive, appeasing communication style - exactly the kind of communication style our abuser trains us and compels us to use - in your dealings with work and your manager.
For example, you didn't need to call him the day you fled, although I understand the sense of duty you seem to have felt, and wanting to do right by them. You can start to put your own best interests first now, and act to protect those. It's a really difficult thing to get to grips with after abuse, but it will also help.
I don't want to make you feel bad about yourself, but I think being aware of this will help you as you approach the meeting and try to resolve this. It might also help you feel less stressed if you can be more assertive (not aggressive) in the way you communicate with work - because it will help you feel more in control.
Do you feel that you need to try and find the solution that best meets your employer's needs without any flexibility from them - or any right for you to say what you would like or influence the decision or process? It's how it comes across, and I wonder if it was how you felt with your abuser? That you also had to pre-empt what he would want and try to offer it first before he had to tell you?
You don't have to behave like that in the workplace. You can say - calmly, assertively (which means acting for your best interests without trampling over other people) - which options you would like to consider, and remind them of the value you bring to the business, and your dedication, and ask them to work with you to consider it. Frame it as a positive thing for them too, whilst being realistic about obstacles and offering solutions.
You've got two weeks. Speak to Acas (free helpline) to be clear for yourself about your rights to request flexible working and how to go about it. Spend some time thinking through different options - be innovative and creative, don't write things off as impossible until you've given them an airing and looked for ways to modify them to make them possible - and draw up some proposals to discuss.
Spend a little time looking at communication styles and negotiation styles (collaborative styles) to help you break your usual pattern and try things differently. (Google "centre for clinical interventions" (cci.gov.au?) and then look at their resources on assertiveness as a starting point.) See if you can bring a supporter to the meeting if it would help.
And take care of yourself. You've been through so much and you've shown so much courage. Things will get better and you will get through this. You've done an amazing thing for your future by taking this scary step, so please don't give up on yourself or other people yet. 