uncovered lots of feelings about my teenage years and parents divorce where I was made to feel responsible for their emotions,
Your whole post resonated with me, but this bit was like a lightbulb. I've just realised that this is what happened with my parents - I was made to feel responsible for their emotions. There were certainly other things in my childhood, but I've suddenly realised this is where most of it stems from - mainly my mum, but also from my step dad.
A cousin of mine once asked his mum "Why doesn't Aunty X like Tiptop?" Because of the way she treated me in general, he was quite young at the time as was I.
I lived my life on egg shells, but no matter what I did, how hard I tried, it was the same result. If I did something 'naughty' (that I now realise kids do, normal things) it was the end of the world, if I hurt myself and cried, if I broke something it was never about me, it was about how she reacted to it, can't ever remember being comforted but shouted at and just made to feel like I was just an inconvenience and a bother if I took up any time or energy. And worse sometimes I'd be accused of making it up, or doing it on purpose to piss my mum off.
I had appendicitis as a teen, it burst as it was being removed, because she was convinced I was making it up and wouldn't take me anywhere or call anyone, she finally did to "Stop all the fuss" and the last words to me as I was put under for the OP were "If they cut you open and find nothing wrong with you I'll kill you". She was a nurse for 30 years, but seemingly blinded to the clinical symptoms because it was me. I was terrified when I woke up and spent almost a week in hospital because I developed a post op infection. We were going on holiday two days after I got out and I never heard the end of how I "Almost ruined it for everyone".
I've known since my 30's that the way I am as an adult stems from that, the constant anxiety that OP describes of inconveniencing someone else, hurting someone else, that I'm just in the way wherever I am and whatever I'm doing.
I've got better, I used to take so much and then explode and people would be really offended and upset - I went about it the wrong way but I also learned from it and slowly my mind set is changing and I now won't take it so much, I speak up, my feelings are as worthy as anyone else's. I stand up for myself but in a thought out and calm way usually, and after the event.
It's exhausting though, I totally get it.