I never experienced the emotions you are going through. But I might have if I had known about the fibromyalgia when I was young. I now know I've suffered with it since my early to mid 20's. It started out with so many seemingly unrelated problems. Every year it was something new. I always thought I was healthy mostly but had these stupid irritating health issues that I could always deal with. I just had to change my diet, research more herbs, find ways to handle stress.
The problem with the fibro is that it gets worse every year. I still have some times of few flares. But the flares hit harder, come more often, and last longer the older I get. I run a daycare and am open 7/24. That probably doesn't help. I did that in my early years and now I have so much debt I can't change it. If I could go back and change my life, learn to live cheaper, not have as many kids, and plan for my middle years..... I don't know if I would have changed anything. Fibromyalgia wasn't heard of when I was in my 20's. At least, back then I hadn't heard of it and the doctors all thought it was bunk.
My girls and my grandkids might be responsible for some of the stress that triggers my flares. But they are also the lights of my life. I can't imagine a life without them and I want to beleive I would not have done anything differently. If I had stopped at 2 children, my daughter and grandson would not be here now. This little guy is my angel child. There's no way I want a life without him in it.
You have to decide if you will hate yourself 20 years from now if you are facing empty nest. What happens if your one child doesn't want kids? My stepsister died suddenly last year at only 31 years of age. She never had kids and my stepbrother doesn't want any. My stepmother would have no grandkids at all if she didn't think of my brothers kids as her grandchildren. She and I are not close. So she's never known my kids.