Toddler anxiety/panic attack/intense meltdown - science backed approaches?
As the title says, we're dealing with a very strong feeling toddler. She's 1y 8m old, and has been having these meltdowns for the past half a year I'd say. It always starts from us holding a boundary (can't have scissors, couldn't play with seatbelt, etc.), and develops into a uncontrollable episode of sadness. These differ from a "regular" tantrum in the sense that she's not angry or agressive, she just very fast gets incredibly sad, starts breathing rapidly, hyperventilating, gagging/vomiting, sometimes shaking, panics and cannot comprehend or receive anything we say to her.
These are pretty distressing of course to her, but also to us and her sisters. Calming down from them takes easily an hour or two, and she clearly wants to calm down sooner than that but is unable to. She will repeatedly ask for help and will sign that she's "all done" while sobbing her heart out. It's really sad to see, and imo borders more on an anxiety attack than a meltdown.
The additional context is that I used to have these as a toddler/kid/teenager, and they were dealt with really poorly by my parents (think holding me down until I stopped). As an adult, I have pretty bad anxiety and feel like there's a connection there. Thus, I'd love to deal with these episodes correctly so that she'd potentially avoid the adult anxiety thing!
Currently I'm going based on what I felt like I needed when I had these meltdowns as a kid, but would love to know about any research/science backed methods to read up on to better help our daughter. Thanks in advance!