What could be causing these symptoms? In the last 2 weeks, i have been having the floowing symtpoms:

-sudden weight gain, not related to overeatting
-extreme fatigue/dizziness when standing
-chest pains on left side
-heart flutters
-shortness of breath

The pain in the left side of my chest has gotten worse, and is a constant pain. All of these symtpoms seemed to happen at about the same time. Heart problmes do run in my family; my dad died from a heart attack, and my brother has heart murmors. 

Other than that, i am a healthy, mid-twenties woman, dont take medication, dont drink or do drugs. My main symtpom is the chest pain in the left side, and the fatigue and short breath. I dont have diabetes or anything, and have already been checked. Can this all be related to the heart, and should i go get checked? It's just getting worse. But i'm scared it could be something serious, or nothing at all. 
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Summarized question: Should I go check if I have symptoms of chest pain in the left side, fatigue, and short breath?