Question

FIRST CONDITIONAL

What (we do) doctor if she (feel) any pain during the night?

Unless you (hand over) the money at once, I (shoot) you!

Answer 1

What shall we do, doctor, if she feels any pain during the night?
Unless you hand over the money at once, I will shoot you!

Answer 2

What will we do doctor if she feels any pain during the night?
если unless заменяет if, то будет так(Unless you  hand over the money at once, I will shoot you), а если нет, то наоборот