I'm 21 with tachycardia issue, had an echo, ekgs, cardiac ct angiogram, bloods, chest ct, 24hr holter. keep getting sweaty and tight in the chest and sometimes skipped beats eating dinner. causes?

Brain ≈ Heart Rate: Without brain input, heart rate ~110 bpm. Heart, (like rest of our body) & heart rate constantly split second controlled from brain. Vagal acetylcholine release slows rate, sympathetic adrenaline/noradrenaline release increases rate. Fear/anger/stress (subconscious), high thyroid hormone, low heart output (for whatever reasons) & re-entry circuits are common reasons for rapid heart rate.

Svt?: May need an event monitor to diagnose exact arrhythmia.