Good day, I was shocked when I was a teenager, 39 now, by a household electric floor polisher, it lasted a few seconds maybe minute. Never went to a doctor,lately Ive been having these chest and back pains, sometimes it even feels as if I can still feel the vibrations in my chest.  should I see a doctor, went several times last year but they always say its inflammation, but I didnt tell them a bout the shock when I was a child.
It can not be a possible that somebody has got electric shock in childhood and the symptoms starts in adult stage or later.  Your current issue must be due to the lifestyle.  You can go for proper heart health check here they will take your ECG and will also suggest for some blood test and see if anything gets evaluated.  Also do not forget to check your cholesterol, BP as well as sugar, you can also check TMT(treadmill test) to know better way your heart capacity..... And have balance in 4 things, diet, exercise, rest, and positive attitude.  Take care.