How should i deal with automatic disorder? it's too soon for me to get tired (fast heart rate, fainting, sweating after a couple of mins'running)

Autonomic disorder: If dysautonomia, then you need either a cardiologist or neurologist to advise you because other conditions may be associated with dysautonomia. If this is pots only, recommendations may also include increasing fluid & possibly salt intake, though it needs to be addressed with the physician who knows you to ensure it's the right thing to do for you. Personalized medical advice thru your doc only.