Some incidents suddenly scares people. Example- Sudden Dog's bark in a lonely street when you are walking alone. Ya normally people get panic or get scared suddenly and normally they recover within some time but here is my problem, I feel like I can't recover easily. After any of this kind of incident, my heart feels like it may stop anytime a kind of uncomfortable in the mid chest and haven't seen any type of pain until now. But a type of uncomfortable scare at the mid chest. Normally recovers after a nap. Some times I wake up breathlessness too. But would be fine after a sleep. It has happened n number of times and my BP is 130/85 around and am 114 kg with 167 cms height. This condition subsides with Librium 10 SOS and have tried 2-3 times with my physician's prescription. I just wanted to know, is this an anxiety disorder or panic attack or something related to my heart, please advise.