The probe they use when scanning can be painful. It should settle down soon. Take paracetamol for 24 hours & hopefully that will help.
I had a polyp removed in Jan this year - I think my lining was 8mm & I was worried sick but it all ended out ok. They performed a hysteroscopy and although it was painful it was not unbearable. I sang when it was at its worse, just to take my mind off it.
It's all the worrying before hand.
Love Cazi x