I came here to say this.
having been a sufferer myself (until I had lots of therapy! Life is so much better without this kind of horrible pain!)
I know that no amount of people telling you it’s not a big deal will help.
if you have RSD, what you’re feeling might be a deep physical pain that makes it hard to enjoy life at all right now.
if that’s the case, know that you’re not alone in this, and that this is normal and what you’re feeling is okay! BUT the stories your mind is coming up with as to what it means that she hasn’t asked you- those things aren’t true. At ALL.
the only facts you have are that you’ve been invited to her wedding, and that she will have bridesmaids (are you certain of this? Some people don’t want bridesmaids.)
there is a lot of political family jostling when it comes to bridesmaids and all that - sometimes it can be an absolute nightmare. You don’t have any info as to what she’s going through, or who she’s having to please with this. Weddings can be such a minefield for creating strife!
if this is someone you consider a dear, close friend, just try to trust that there will be some reason for this, and it’s NOT a rejection of you.
there’s a TED talk out there about rejection, and how it shows up in the same place in our brain as when we are physically hurt. The brain lights up like we broke a leg or something.
the way to help it, it is said, is to choose a trait about yourself that you are glad you have, proud of, that you feel is good. For example, your loyalty to this friend is quite a lovely trait.
then write about that trait. For some reason, this has to be writing by hand (not typing), in order for the brain to heal. Write why it’s helpful, why it’s a lovely trait to have, and how you would value someone with that trait in your life.
it’s a way to set the wound. It’s a way to deal with the hurt. Whether or not she rejected you, you’re feeling as if she did, and those feelings need some care.
hugs, op. I hope you find out she had to ask family members - I hope you go to the wedding and have a wonderful time - I hope you wind up being so glad you’re not stuck in a bridesmaid’s dress, in that tedious job (it can be awful! And expensive!)