I have a defibrillator and am not sure if this is a silly question but I wonder if anyone can tell me what it feels like when it it delivers a 'shock'? From time to time, usually in the night, I feel as if I have been punched in my chest followed by a wave of feeling moving outwards. At other times I feel a wave of squeezing coming up from my feet! Which feels as if it is pulling me up from my feet to my chest. This all sounds bizarre but it occurs to me that someone might tell me if this is my defibrillator working or just middle of the night getting older feelings. I am otherwise extremely well. Thanks so much.