AF, I agree with everything Mecanix said. I would give FB a break, if it triggers you in any way. I jump on FB once every other day or so, but I definitely wouldn't if I thought a connection there would trigger my AV.
Just stay sober, and everything else will fall into place. Good for you for trying to stick up for your niece, but your number 1 priority right now is you.
Sorry that happened to you. Just try to get back on the positive side of things.
Stay strong!