Is there any idiom which means stop asking too many questions and also contain back and forth in it?

Nothing perfect (what do you mean by back & forth?), but sometimes you can rephrase for it to sound well enough, so a few alternatives:
Barking up the wrong tree.
Cross that bridge when you come to it.
Curiosity killed the cat.
Don't look a gift horse in the mouth.
Let sleeping dogs lie.
Nosy porker.
Silence is golden.

Surely you've noticed the usage of quid pro quo in silence of the lambs. Allusions are a nifty literary tool as well.

Not an idiom, but there's this wwii poster, search "if you talk too much this man may die".

Besides, how would idioms be born in the first place, were it not for experimentation with clever wording?