Counselling can help with almost any emotional problem.  I have listed some of the most common problems below, but there are many more:  

Anxiety, obsessional behaviour, depression, relationship problems, post traumatic stress, phobias, eating disorders, sleeping problems, stress, self-harming, low self confidence/self esteem, post natal depression, work issues, abortion/miscarriage support, bereavement, physical/emotional abuse, burnout, anger problems, family issues.  General unhappiness.  

It's difficult to say at the start.  It can vary from 3 or 4 sessions to months or longer. 

This will be down to how you feel about your progress, and whether you have achieved your aim.  I will let you know if I think the work is done.

Thats fine.  Its always a good idea to talk about why, but its your choice.

I will try to refer you onto someone that can.

That's fine too.  There's no obligation to continue.

Being nervous is very normal.  It is your decision what to tell me.  There will be no pressure from me.