Should I go to the doctors? 🤔

So I can't stand up for more than 3 minutes without struggling for breath 🤔,my heart goes really fast and I have to sit down. I am not unfit, I'm also not fat,I get told I need to gain weight,which is true,but only a tiny little bit. Also, I get a pounding heart a few times throughout the day,no matter what I'm doing. Actually as I'm writing this now,and I'm in bed about to sleep..

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