OP I think many people have this "idea" of a perfect family and when they will have/plan children.
Truth is people whose plans fall in line with reality are pretty rare.
If you're high risk for HG it is going to be harder for a second pregnancy when you already have a child to parent.
You and your DH need to be realistic about this.
You're likely to need a lot of support through a second pregnancy.
Can you fund this now?
The fact it won't be easier now or in 5 years is irrelevant.
What's important is your mental health in facing HG again, the support you can access and your willingness to go through it - this year or the next.
If you're not ready (and you might never be ready) that's ok.
Better to be a good mum to the child you already have than one worn down by HG and possibly PND by chasing a dream.
I called it a day after one pregnancy.
My DH had a child through a previous relationship so he was fine with that.
Regardless I wouldn't have done it again even if he had felt differently.
I understand some women enjoy pregnancy but I think even other women underestimate HG and belittle the experience.