I could answer your 3rd question, the others have been answered already.There is two basic questions to answer here:
- would your time freeze to an external observer
- would time freeze for you, or what would you experience
The answer to #1 is yes, it would. Them mathematical description is in other answers correctly, so I am not going to repeat it. But to understand it, imagine you have small photon clocks inside your body. (to the best knowledge today, we imagine most of our mass/energy due to massless gluons traveling/oscillating at speed c in some kind of confinement, and quarks, but nobody knows what the structure of a quark would be, we think of it as pointlike). So we will take the small photon clocks as analogy to the gluons. The photon clock has mirrors, and the mirrors reflect the photon, that is a tick. As your body speeds up, the photons would have to catch up to the mirrors, but at speed c, the mirrors would move at speed c too, so the photons would never reach the mirror, no ticks. Your time froze to an external observer.
To point out, this would also mean that the internal structure of your body would freeze to an external observer, since no information could be sent any more about it, since its pieces would be moving at speed c, and the interactions inside your body, and the photon clocks, would seem frozen.
Now also to point out, according to SR length contraction, your body's size would also be pointlike to an observer.
Now to answer #2 is not so simple. You would still see your own photon clocks tick normal. And your body would therefore act normally. But you would see the whole 4th dim. at a glance. You would see the whole timeline all along its path, the beginning of the universe and the end and all of it inbetween as snapshots. And of course as a 3D viewer can see every bit of a 2D plane at once (without obstacle), you, now a 4D viewer would see every bit of the 3D world without obstacle, folded out, every 3D structure would be folded out so that without obstacle you could see every bit of it.