I have a good friend with schizophrenia that is well controlled with Invega. Anyhow, when he misses a dose, the symptoms come back and they are not always voices like most people think. Often times he hears tinnitus-like high pitch sounds and even music. He has, at times, mentioned feeling things that were not there, such as believing someone was poking him. He often tells me about the fights he gets into that never took place. Although to the outside observer it may seem like total rubbish, to him, all of it is very real.
The other possibility is that something, or multiple things, are actually happening. For instance, those people that hear low pitch hums that they couldn't seem to escape from, most of those cases ended up being in areas with natural gas pipelines underground in the their vicinity. Resonances form in the gas pipe from the flow that are low enough that only a select few are able to notice. Perhaps the sounds and vibrations are from that, and the heart issues are from something else like caffeine, THC, dehydration from drinking nothing but soda, or magnesium deficiency ~ all of which have, at some point in my life, affected my own heart in similar ways as you describe, pain and aperiodic fibrillations.
Before allowing yourself to be convinced that someone is out to get you, take the time to honestly explore other possibilities.
Edit: and right now I am experiencing a perfect example of another possibility. I live out in the woods. The nearest highway, the way the bird flies, is across a lake, beyond a swamp and through the woods about a mile and a half. I can barely hear cars when I am outside, and it has to be quiet out to hear them. However, inside the cabin, I hear them like they are a block away. Something about this ground or hill or the concrete piers the cabin sits on, maybe in conjunction with the small size of this place, makes every little sound noticeable. I would probably be able to detect cars 5 miles away if I wedged a piezo element between the cabin and the piers it sits on with an oscope alone, no amplifier. I have felt distant earthquakes in this cabin too. Minnesota is considered one of the most stable places on earth geologically, but we do get a couple small ones. The last documented house-shaker was in 1928 about 10 miles from here in Bowstring. About 5 years ago, I woke up to this cabin rattling (three short distinct periods of shaking). The next day, while fishing, I noticed gas bubbles rising from the entire shoreline at once where the water is shallow. I assumed it was another similar shake releasing decomposition gasses from the lake bottom. The iron range was not blasting that day. I have yet to encounter a single person that noticed those little quakes, but this cabin sure did!
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