I haven't heard the full story of 'kaisi teri khudgarzi'. It could be a story related to a person's self - centeredness or self - indulgence perhaps. But without more context, it's hard to say exactly.
The ending of 'kaisi teri khudgarzi' would depend on various factors such as the character arcs, the themes explored, and the overall plot direction. Without having delved into the story deeply, it's impossible to give a definite ending. However, generally in stories, there could be an ending where the protagonist overcomes all the obstacles in their self - destructive behavior (assuming that's what 'khudgarzi' implies) and finds redemption, or perhaps they succumb to it which would make it a rather dark ending.
I really don't have much to say about 'kaisi teri khudgarzi' as I don't know what it specifically refers to. It could be a local story, a family tale or something else entirely.
No, 'Sanam Teri Kasam' is purely fictional. The plot and characters were imagined for the purpose of entertainment and not drawn from real-life events.