Panic attacks from the Anxious trait never stop unless the pawn has a dedicated bedroom for themselves (i.e. barracks don't work). If the pawn is later assigned a bed in a dedicated bedroom, they will just stand where they are and the attack will never end.

This also means that a pawn with Anxious cannot ever have a lover/get married, as that means they'd ostensibly sharing a bed. Shared beds don't count towards the dedicated bedroom requirement.