Flooded, might be the word you're looking for. I know that's how I feel in these situations.

Often it has felt like an assault in a way, when I'm just minding my own business, looking for a bit of chit chat and a stranger of sorts dumps on me like that. I'm not a professional, I have a mental illness, and trauma of my own, I can't cope with s*** like that. I will bear up and give my best when it's a loved one, but I do not have the bandwidth to deal with strangers or people I do not know well treating me like I'm their therapist or primary support person. This is one of the many reasons I stopped using peer support sort of things. If it's not run by a professionals and there is not a qualified facilitator (not just another consumer) present, I steer clear.

What I've done when I've encountered this is take a step back from the groups or one-on-one stuff for a week or more, and just focused my energies on stuff that is fun and recreational or productive for myself only.

Hugs to you Whatever, that's a rough day you've had.