I think a better place to ask is the icd support group. Lots of experience there with regards to shocks and ICD settings to minimize unnecessary shocks. Also meds and ablation.
It's like knowing if you touch a door knob you are going to get a static shock. You know it won't really hurt you, you know it will only last a second, but you still don't want to touch that darn door knob. Only this is in your chest and it will reset your heart rythm. So, yes, serious trepidation. Knowing you have to touch that door knob, and knowing what's going to happen, you do whatever you can to minimize it, but you still know it's going to happen. The depression is from knowing it will happen for the rest of your life. The newer technology is supposed to minimize the number of unneeded shocks and can be programmed around your normally abnormal arrythmias unless life threatening. In my case I happen to feel the recalibration as small static shocks, pretty much daily at 1am. It's not a full out trigger of the device but it's enough to wake me if I'm sleeping or anxiously await it if I'm awake. But they tell me most people don't feel it unless it's a required full trigger so your mileage may vary. DISCLAIMER: I am NOT a doctor. You should only accept medical advise from a licensed professional.