I am something, a lot of people don't like me, including you. But I'm called upon anytime one is injured.

I am something, a lot of people don't like me, including you.
But I'm called upon anytime one is injured.
I like playing with pregnant women,
I'm a 5 letter word,
and if my last letter is put before 1st letter,
I become a name of a country,
What am I ?
If U get this, You're Indeed a Genius.

Answer : PAINS