Can anyone help me? I'm basically scared out of my mind for the past week I've been VERY stressed out. My dog almost died which made me completely broke. But also I was having black vision upon standing due to not enough water. I'm 20 I lost 55 pounds and I eat healthy. Tonight all of sudden i was having heart palpitations and shortness of breath and nausea. I'm EXTREMELY scared im going to have a heart attacks. Plus im freezing and shaking too. Can someone tell me if I can have a heart attack being just 20? Please I'm VERY scared.