For the past week my heart rate has been well into the hundreds while i'm at rest.

I'm 16 .  I wake up one morning about a week ago and my heart rate is 130 for no reason. It caught my attention because I could hear it thumping in my ears it was pounding so hard.  It hasn't gone under 100 since. It's gotten up to 170. I haven't been doing exercise or anything to make it that high. I'll be sitting down and start breathing heavy like I just ran a mile but I'm sitting down. I've been very light headed and nearly pass out every time I stand up too fast or bend over. I feel like i'm running a fever yet my fingers and toes are freezing. I've started to see dark veins in my hands and feet and legs that were never there before. When I press a finger against my skin it takes a good 10-15 sec for the color to come back.

I try to and take it easy because when I stand my heart beats faster and I feel short of breath. after standing for long(ish) periods of time(30-45min) the lower part of my legs look bruised, with black and blue and will ache slightly. but I'll sit down and it'll go away in like 5 min.

 I've never had anything like this happen to me before and there aren't any heart problems in the family. Does anybody think this is worth discussing with my doctor, she tends not to take me seriously but I feel exhausted for no reason and these are very peculiar symptoms to me. What should I ask her about? I'm not entirely sure if it's cardiovascular related but since my heart feels like its going to beat out of my chest I thought I'd ask. Thanks to whoever took the time to read this.

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