"end" vs "get over"

[Crazy]

"This kind of pain lasts much longer and it does not get over in 15-20 days."

1) Will there be any change in meaning if I use "end" in place of "get over"?

2) Can I use only "over"? If not why?

[Haihao]

1) Yes, there is, I think. 'get over' has a sense of 'recover' whereas 'end' could mean 'stop' but I feel it's awkward to use 'end' here.

2) No, you can't. Because 'over' can't stand here alone as a verb which the sentence needs.

[Jamie (K)]