First off, you shouldn't feel stupid for having things affect you, because it's not stupid at all. Different people are affected by different things, and it's completely understandable.
I know it sucks to have to hang out with family, especially when you really don't feel up to it. But I suppose in this case you just have to.
Like someone already said, can you talk to your mum beforehand, and ask her not to mention your appointment to everyone? Just try to explain to her that you'd rather not everyone knew about it. (Also, well done for getting help and having a psych appointment, good luck!). And when your sister teases you, just try to laugh it off, or ignore her as best you can. I know it's easier said than done, but give it a try?
For the moment, before you go, just try to stay calm. Do your best to fight the urges, you know you can do it. You'll get through it. Try to do other things, things you enjoy to take your mind off it.
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