What Causes Chest Tightness, Anxiety And Chest Discomfort While At Work?

Question: i am having some odd symptoms, often presenting like cardiac, however an echo and stress test show that they are completely normal. I had a 24 telemetry test to which I had some PACs and some PVCs, with a few Ventricular runs, up to 8 seconds long. I am 33 otherwise healthy, no caffiene drugs or stimulants. My symptoms seem to be worse when I am work with chest tightness, anxiety or a warm sensation in my chest with a bit of a pressure feeling. I have gone to emergency, since i work at the hospital and nothing seems to show. i questioned if i had a tumor on my adrenals or something that released adrenaline. The symptoms seem to be very random and without any really cause. I do have some aching in the lower chest at times around my diaphram and wonder if there s any issues with my liver or pancrease that wouldd lead to all these symptoms. My bloodwork is normal, i have a healthy lifestyle otherwise and am not stressed or anxious otherwise. Another thng I questioned is am I having a reaction to the amount of computers i am exposed to at work? and or the bad lighting that seems to affect me? Has that ever happened, i feel increassingly worse throughout the day at work and my symptoms seem to get worse wth more PVCs etc as the day goes on. I often request the lights stay off because there seems to be a difference. Or could i have some endocrine problem, my TSH has been normal range but my thyroid feels slightley enlarged. As I mention bloodwork was normal, including my liver enzymes, cardiac enzymes. I feel as though something is just not right and it seems to be generating somewhere from my diaphram to my chin. Could this be biliary or pancrease? i have a chest xray wwhich was normal. what are we missing.