@Celledora you've probably watched this video already if you've been doing research. But thought I'd share it anyway -
It describes me to perfection! I really think you've hit the nail on the head. I think that's what I have, combined with OCD. It says teasing is a trigger, and I CAN'T BEAR to be teased. I can't bear banter. That's what happened with my brother-in-law. He teased me about something I'm super sensitive about. Innocently, so I reacted calmly initially, and just said 'please don't '. He'd been drinking, so didn't take me seriously, and persisted, ramping his sarcastic teasing up a knot. That's the point I just burst into tears, and my mood went from happy to totally despairing in an instant. I felt disrespected, as well as hugely triggered by the words he used, although used in jest. To me EVERYTHING was ruined. I couldn't see it in its few minutes isolation. To make matters worse, he then got a bit defensive, as he hadn't intented to hurt me, and he got a bit cross about my overreaction. That finished me off! I hate any kind of conflict at the best of times. But this was the most stressful of times.
It's literally dominated about 99% of my thinking time since.
The description of RSD makes total sense. The feeling of physical pain in response to any kind of criticism, teasing, imperfection or personal mistakes too. That combined with OCD leaving me stuck. Then intense guilt and self-loathing. Nobody in RL has had much patience for me, which has compounded those feelings of feeling criticised and rejected.
I'm sure I've got this thing. I will seek professional advice.
I actually feel a bit calmer now I've heard about it. That maybe there really is something in my brain, I'm not just being silly.
Anyway, thank you so much for telling me about it. Best wishes and healing to you 😊