Hey let me answer all those questions and save some money and time:
What are the ultimate goal and purpose of human existence?
Inherently nothing other than letting your genes go over to the next generation. Of course you can choose a purpose for yourself, like in this example con as many gullible people as possible.
What is the cause of natural disasters, global warming, and epidemics?
Chance and human ignorance/short sightedness.
What really happened in 1999 and 2012?
Many things happened but I will guess that it had nothing to do with aliens and/or gods what you would probably claim.
What Great Event occurred invisibly in 2017?
If it occurred invisible it can not be that great. So it was probably just your imagination.
When will Armageddon and the Last Judgment occur?
Never. Alternatively if you mean the end of the world I think that will happen when the sun puffs out of existence kn 4 billion years (or something I am not sure but it’s a long time)
What should you expect in the coming decades?
No one knows for sure. It could be a scientific utopia or the end of civilization.
Why are people dying, and is there a chance to be immortal?
Humans can die because of all possible reasons, from crime to old age. There is no way to become immortal nor would that necessarily be a good thing.
Why does it seem that time is speeding up?
Because you experienced more as you get older so time will get less in comparison. But time moves always at the same speed, Black holes can be an exception.
What is the famous Philosopher's Stone?
A myth
and much, much more!
I don’t think so.
There you go