I'm on the spectrum and I also get panic attacks. During a panic attack I will breathe heavily. I've tried stopping the heavy breathing but it's hard as I need to get the panic out someway. Heavy breathing sometimes helps me not to scream so I just breathe heavy because it's more socially appropriate. Is this normal for panic attacks or is this stimming? I know the breathing heavy is normal for panic attacks but I'm starting to wonder if I'm continuing the heavy breathing as a stim.