sleep apnea, tachicardia, and arrhythmia

Ok, I am 27 years old. For the past 4 years Ive had chest pains with palpitations and arrhythmia occasionally and a heart rate of approx 120 give or take a few above or below. Ive gone to cardiologists (who usually think Im a hypochondriac because of my age)Ive had blood work, stress tests, echos, and wore a 24 hr monitor (of course nothing happened when I wore it accept the heart rate which never goes down.) Well about 2 years ago I was diagnosed with obstructive sleep apnea. I didnt do well on the Cpap so they decided to try surgery I had a UP3 which is cutting down my uvula and widening my throat, still no relief. Ive brought this up to my cardiologist because Ive heard there can be a connection to sleep apnea and heart issues. But they all say the same "a heart rate like this isnt healthy, it can cut your life short" But none of them seem interested in me having sleep apnea, or can find anything wrong that could be causing it. Does anyone have a clue what could be wrong with me??