I don't drink coffee, or coke, but everyday, i feel so tense and my heart is beating so fast?

Tachycardia : First you need to check your pulse & get ekg to see exactly the rate and rhythm. Then lab tests for thyroid and anemia and electrolytes to find out any abnormality. Anxiety plays a role but first all medical causes should be ruled out. Please see your doctor for full history and physical examination & appropriate lab. Tests. See http://doctorrajput.Com good luck.

I will recommend : You see a physician to r/o two conditions that are high in my mind. Anxiety/panic attacks and hyperthyroidism. Both gives you almost the same symptoms. A good history and physical by your physician will help a lot.