Do 2 day diet pills give you dierra and do it make your stomach feel funny?

Ummmmm, yes... major diarhhea and major stomach problems and then you wish you were either dead, or nearly dead and you never want to touch them pills again!

That's not all.
Losing that much weight is unhealthy for your body and when you stop taking those pills, the weight will soon come back to you.
There is no such thing as a quick weight loss.
If you really want to lose weight, do it safely, and keep it off, ask, I will elaborate.