Job Interview tomorrow

I am so nervous about tomorrow, it is for a Night support worker role (I'm currently on maternity leave) , less hours, more pay and seems a lovely company to work for and I will be able to grow in my role.
I was just wondering what type of things they will ask? you have to have experience (I have 7 years experience and a NVQ level 2 in health and social care) so they are going to ask questions I should know, I panic when I'm put on the spot and stutter, I'm so much better writing things down, because my mind just goes blank. am I able to take notes in to jog my memory?
The big question companies like to ask is what can you bring to the company??? 
I'm terrible at bigging myself up.  
 So nervous and anxious!!