I drank 2 energy drink and coffee and then i suffered for 3 hours of fast and stong heartbeat and dyspnea ever since i have a very fast and strong heartbeat,dyspnea,fatigue,sighing feeling the ecg and holter shows sinus tachycardia the echo is normal?

You need to avoid energy drinks and caffeine as much as possible to avoid increasing your already fast heart rate. There can be many reasons for a fast resting heart beat including but not limited to discomfort, fever, anxiety, low oxygen levels, blood clots in the lungs, etc. A thorough evaluation by a cardiologist and perhaps pulmonologist would be needed to diagnose your tachycardia. Good luck!