Would you mind quoting us the original and the new so we can compare more easily? That being said, I finally found the original at the bank, and I like it better w/the caveat that it be a scene at the bank's office as opposed to a summary of what happened. Where you're starting now (waking up w/the nausea) works because it's a scene, but I'm wanting to know 1) why she's nauseous, and 2) how she feels emotionally about being nauseous (which may be one and the same if it's nausea from nerves for example). The bank scene has more voice and puts us in the thick of the what the potential conflict is, whereas the waking up nauseous puts us squarely in Milly's POV but doesn't tell us much beyond that. Of the two, I'd be more likely to keep reading about the mortgage downsizing, but that's just me.
Hope this helps!
Thank you, unfortunately there was misunderstanding around my original because there wasn't actually a bank scene

just Milly reflecting to let the reader know what's lead to this point in time.
So there's the downsizing/outsourcing = you're out of a job which means no money to pay things like mortgage.
Then my humour failed on the next bit. The idea that someone who has just had their job downsized suggest that they downsize their mortgage payments - it's what a lot of people would like to do but doesn't happen in serious reality. Then the reality bit - she has to sell. As it's "her beloved city flat" I hoped that let the reader know that she thought she was happy with her life - she liked being where she was.
But, as I didn't really get across what I'd intended I decided that maybe it wasn't the best place to start, so I moved ahead around 40 hours with the idea that the original opening would be worked in as backstory.
OLD
"Downsizing," they'd said at the meeting. "Outsourcing."
(The meeting where Milly is told she no longer has a job)
Milly's bank manager hadn't been quite so enthusiastic when she suggested to him that she
downsize her mortgage payments.
(See * below)
She hoped that a quick sale of her beloved city flat would enable her to rent somewhere cheap, if not particularly cheerful, until she figured out what she was going to do.
(She's not in negative equity (I think I'm putting my MC through enough already), can and does sell albeit not particularly quickly. In the end it's not as hard as she thought it would be because lots has happened and she is much happier where she ends up instead)
*The details of what's happened to her mortgage aren't important - the idea that she would go to her bank manager (no, it wouldn't really be likely to be the actual bank manager) and suggest downsizing payments is the important bit - it's her quirky way of looking at things.
"Oh hey, Mr. Bank Manager! My job's been downsized so I'd like to downsize my mortgage payments for now. That OK with you, Mr. Bank Manager?"
NEW
What was that awful noise? Milly tried to ignore it, but the noise seemed to come from all around her. She fought waves of nausea and willed herself not to throw up as she lifted her head and slowly opened unwilling eyes.
she isn't waking up but regaining consciousness which is (hopefully) clear over the next 3 sentences.
I can work from either point as an opening - as I say there's around 40 hours between the two points. I know both do need work to make them better but knowing which is the better place to begin - which will make my readers want to know more is key for now.