I feel sob especially at night, morning it's fine, .i am having mild mvp with mild regurgitation .is the sob is related to that?

No. : Mild mvp with mild mr shouldn't give you any symptoms at all. Especially at age 20.

Shortness of breath: It is unlikely that your shortness of breath is related to your mitral valve disease. Given that it occurs when you lay down at night, it may be related to reflux disease. Make sure that you don't eat too close to bedtime and try to note if some foods or beverages can trigger your symptoms.