Narcissistic mother & sister, my anxiety & triangulation

The anxiety, panic attacks, depression that I have ongoing, flares up when I'm associated via texts with the mother. So I went no contact months ago. But....my mother and my sister have spread lies to other family members about me and told all my siblings that I hate the family. Of course they all believe her and find me to be the enemy. So... the other day I run into a brother. He talks to me, but not about the problems, but only about his new business. It's a huge elephant in the room, what do I do? I was nice and cordial and hugged him, told him I missed and love him. Then the anxiety again begins, I so far since the other day am sick, dizzy, headaches, cant eat, panicky, shaky you name it. How do I deal with the elephant in the room? I have in the past tried to talk to my siblings about what my mother and father have done, about how they wont take a minute to visit my handicapped son, their grandson. But.....they all tell me to just forget it, and move on.
Meanwhile the gossip continues as does the lies, manipulation, guilt trips. I'm going crazy over this, my feeling don't matter to any of them.

Sorry to hear your family are giving you problems.
The less you have to do with them the better, realize it's them with the problem not you, perhaps they have issues themselves and can't help be that way and there's nothing you can do or say to change it.

Find some support or people who make you happy and it won't effect you as much. All the best.