Yes it will shrink down over time.
Just take it out and leave it. Unless you have had it stretched, if you have stretched or had a larger hole cut i would suggest seeing a plastic surgeon. If not, and you have a normal navel piercing, just take it out, it will heal and close up and be unnoticeable over a short period of time.
No the hole hasn't stretched and you should avoid playing with it, it's a new piercing and the last thing you want to do is play with it when it is trying to form skin and heal. Follow the written aftercare instructions you were provided with from your piercer, should you have questions about your piercing and it's healing return to your piercer have him/her take a look to ensure it's healing properly.
if you go close enough to a black hole you can get stretched to death the end
You don't get them pierced that big it's called stretching, you need them pierced first. If you wanna get your ears stretched start with a small 1mil nn go up i will warn you that it does hurt
yes, but it would be smart to put something in the hole in their place, otherwise the hole will close up
a few hours
if you left the taper in after you stretched it, it might have caused the hole to be that shape. or it may be because when you take the plug out, the holes close up a little bit. but its normal.
just take your navel ring out it may be getting infected
Yes you an have the same hole pierced. But make sure that is where you want the hole this is a second chance t get them perfect.
It depends on how long you have had the piercing and at what gauge, it may close over weeks or months then it may never close. It's nothing to worry about.
No you would be stretched out and torn apart as soon as you got too close
No different from your first hole.