Experience:
I have a diagnosed Panic Disorder in addition to PTSD etc.
Too many to share including some at work.
I usually end up throwing myself on the ground in tears, or running out of buildings.
Lots of cursing is involved, and occasional throwing of stuff (not at people).
Causes:
Emotional flashbacks from trauma (helplessness, shame and guilt in particular), agoraphobia (having to go outside when I don't want to), sensory overwhelm (auditory and visual misophonia, light sensitivity, scentophobia, texturophobia, having my feet covered by blankets or having shoes / skates / boots tied on), being too hot, not being able to breathe (stuffy nose), not being able to get a necklace off without wanting to rip it off and break it, confinement, confusion, paperwork, court / lawyers, and having too many responsibilities.
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I never give you my number, I only give you my situation.
Beatles