Can plastic surgeon remove rejected hernia mesh n tighten muscles while removing fat/skin. Will it help fix my hernia rejection pain what about ins.

Not likely. Honestly most surgeons will avoid touching anything that they didn't surgically place if they can. And since most plastic surgeon's don't do hernia repairs(mostly the realm of general surgeons), they are unlikely to address possible mesh issues, while completing a panniculectomy or some variant of one.