ive been googling (which ik i shouldnt do) but i have been very afraid and i think j have a heart problem. i read that symptoms like chest pain, shortness of breath/chest tightness especially upon exertion which i do get i rarely ever have energy and i get exhausted super fast, fatigue which im always fatigued through the day, sudden fainting (i used to faint a couple times during my childhood) a few times were bc of low blood sugar but other times i just fainted and didnt know why. i havent fainted in over 2 years tho. i am super scared now. idk what todo. theres no heart condition that ik of thay runs in my family but i am so terrified bc all of anxiety symptoms started after fainting randomly onw day. then i woke up with palpitations dizziness etc and till this day( this was back in 2015) i still have symptoms
Live your life my friend.
One day you will look back at wasted time .
Peace 
At any given point there could be a chance of something wrong, that’s the hard truth of life and one you need to learn to accept with Health Anxiety. But your symptoms also point to all sorts of things like anxiety or low blood pressure, going to old dr Google is literally the worse thing you can do as generally it’s always going to point out the worse case scenario first.
Best thing you can do is discuss this with your doctor for peace of mind.