What Am I Riddles

Question: I rise and fall no matter what, only at finals rest do I not budge, what am I?

Question: Occurring once in a hundred years and once in thousands. But never in a day or a year or a century.

Question: I am the beginning of sorrow, and the end of sickness. You can't express happiness without me, yet I'm in the midst of crosses. You may find me in the sun, but never in the evening. What am I?

Question: Men are just as small as stars to me but men can see me while the stars cannot. I am a reflection of the ocean and fire but never earth though without an earth you cannot have me.

Question: I am just an ordinary word that comes in form of a man, accepted by many but rejected by a few, not felt by many but felt by a few, not shown by many but shown by a few. What am I?