I had a heart attack 12 months ago and then developed a sliding hernia, when I lay on my side or flat I have a sensation in my chest and it radiates to my left arm, I start to sweat and feel quite unwell. If I move position and virtually sit up it goes over time. I have had a further angiogram which is fine. can a sliding hernia mimic a heart attack? I am getting in a state thinking I am having another heart attack.