I'm autistic and the youngest sibling by 12 years and not particularly close to any of them except 1 sister who understands me better than the others and is very empathetic about all things in the world. It's a different sisters big birthday coming up and her daughter is arranging a surprise party/dinner just before Christmas. I got the invite yesterday and have been filled with anxiety ever since. The thoughts of going has really upset me. I've always hated these family dinner parties. They fill me with dread and it's worse the older I get. I have anxiety about them for weeks and weeks in advance, it's like a constant black cloud on the horizon.
The dinner is a 70 minute drive away and I find the trip itself extremely anxiety causing and I'm exhausted by the time I get there. Then at the thing they are all so polite with each other it's like dinner at Downton Abbey with all the careful small talk until they all have a few drinks and at least then they relax a bit but I am rigid with tension for the first few hours and can barely say anything, I just sit there trying to smile. It can take me over a week to get over the burn out effect of one of these events. I haven't gone to most of them in recent years.
I have a lot on between now and then too, dental treatment including extractions, eye surgery, 3 hospital appointments for that. Work being done on the kitchen. My carefully constructed routine that keeps me right is already messed up and now this invite has me agonising.
So AIBU to think of declining giving the above reasons? Or am I a selfish bitch for thinking of not going to my sister's surprise party?