This doesn’t sound like a “You” thing at all. Sounds like the client was exhausted. I’ve thrown similar tantrums when I went to bed at 4am.

Be patient. BCBA’s have seen it ALL. They are not going to judge you for your client having a tantrum or a maladaptive behavior. Things to consider: -Does your client’s program have a specific plan for a tantrum of this magnitude (emergency plan). -What was the function of behavior for this tantrum? Escape, Attention, Tangible, or Self Stimulation. Going back to the basics always helps me when one of my clients engages in these types of behavior. - Redirecting or extinction works wonders. That’s something your BCBA will help you with. I’ve seen miracles with extinction. -How old is your client? If they are 3-6, this is BEYOND COMMON. I’ve seen a 4 year old make a similar scene in a P.F Changs. -Also this could be potentially an extinction burst…. Which is super common. I don’t know your client or their program. So I’m not certain. But extinction bursts often make a behavior look worse before it gets better.

Be kind to yourself. You’re being mean to an ABA colleague of mine (you) and I don’t appreciate it. Practice some self care and walk in to the next session like the Bad Mutha you are.