Poltergeist maybe? :O
Seriously now, this is all weird stuff that's happening to you, but don't just make wild assumptions and dive in esotheric comics just yet :/
No, your brain can't develop. Neural tissues and neural-connections develop in early childhood, after that the neural cells have a hard time to repair damage that is caused to your body. Take broken neck for example, if spinal chord could repair itself like for example bone tissue, people could walk again after such accidents, but as you know it rarely happens.
No, heart doesn't generate electricity to drive the body. The heart itself is driven by electrical signals, yes, but those signals come from electrical potential difference between Na+ and Cl- concentrations on either sides of heart cell membranes and bla bla bla, you see, there's medical explanation for that... The magnitude of that electricity is too smal to influence electrical devices. (less than 30 mA of current runs through the heart - D1 correct me where I'm wrong, please
)
We all experienced moonwalking, I believe, not so sure about floating objects, hehe. If I were you, I'd visit one of those, you know, funny women, who see things and can talk to other side... I'm not kidding, I'm sure I would!
It may not help you, but at least you could maybe get some ansers. But first, nag your doctor to do something and dunno, visit a shrink?