StealthG, I really hope you are able to find help soon. I've experienced extreme anxiety on and off the past few years, so truly know what it's like to have days where you can't bring yourself to leave the house. I went through the NHS for most of my therapy. I am not sure if there are actual time limits if they deem you still need help - I had to stop due to moving. I don't think they will push you away after 6 sessions if you feel you still need more.
I've copy and pasted here some information a counsellor provided me. You can get cheaper rates if you are willing to sign up to work with someone who is in training. I hope some of this will be of use to you:
There are two general web sites where you can browse for registered counsellors or therapists by geographical location and by theoretical training and methodology. They are:
www.counselling.co.uk <http://www.counselling.co.uk/>. This is the British Association for Counselling and Psychotherapy and most people abide by their Code of Ethics and Good Practice.
www.psychotherapy.org.uk <http://www.psychotherapy.org.uk/> – a reputable site also with a directory of practitioners.
Other web sites that give reputable information about the difference between types of therapy are:- Young Minds -
www.youngminds.org.uk <http://www.youngminds.org.uk/> and the Royal College of Psychiatrists -
www.rcpsych.ac.uk <http://www.rcpsych.ac.uk/>