Hi Lozza - yes BH can hurt! It sounds like some pre-labour to me, but that can go on for a couple of weeks.
As for the pain - well yes it will get worse, but you have to try and relax as much as you can - if you try and fight the contractions it will be worse for you. Your body is doing exactly what it's meant to - try concentrating on your baby instead of the pain. There are some great threads here about coping with labour pain - I will try and find them for you.
All the best darl!