What is EMDR? I am getting a bit confused by some of the posts to be honest. The one giving you info on BACP and UKCP directories is a helpful post. Posters are talking about counsellors, therapists, psychologists etc and to a large extent these are all professionals who offer counseling or therapy (same thing really) Do you think you have PTSD - there is a MN poster who has suffered from this (her nickname is Madmouse) and I'm sure she will be on soon to help you. Mind she was very lucky she got some good counselling/therapy on the NHS.
Someone has said they had CBT and this worked better than "talking therapy" but that's what CBT is.
You ask what they "do" and "does it help" - the most important thing in my view is that you feel safe and comfortable with the counsellor/therapist and feel you can confide in him/her. Most therapists don't stick to one particular method anyway, they usually have knowledge of several methods an use them dependent upon the client and her needs.
You must remember that it is not a case of what they "do" - they are there to manage the therapeutic process and you form a therapeutical alliance with the therapist. You set the agenda, that is you talk about what is troubling you and a good therapist will gently guide you to maybe think whether this is an echo of something that happened in childhood. This is psycho dynamic counselling, with a lot of attention on your childhood and the way you were parented and how this might be affecting you in the here and now.
At the other end of the continuum is CBT which is not about the past, but is about helping you to manage difficutlies in the "here and now" - it is quite a simple theory and really is about changing negative thoughts into more balanced thoughts, and understanding how our thoughts affect our feelings and our behaviour and we can end up in a downward spiral that is unhelpful.
You ask "does it work" - the answer as you can see from the posts is "it depends" - if your are able to find the right therapist and you feel comfortable and have faith that the therapist can help alleviate some of your difficulties (no magic bullets unfortunately) there is more chance of it helping. Sometime you have to try a couple of therapists before you find someone who is right for you. You must never feel that you have to stay with one therapist if you don't feel comfortable and safe. Mind therapy is often uncomfortable - you know - "no gain without pain" but you must feel safe enough with the therapist to confide in him/her.
YOu ask how long it takes - again - "it depends" - some therapists like to agree 6 sessions and then review to see where you are going .......it is in your hands really and your pocket if you are paying! I think you need to make sure that whoever you see has some expertise in your particular difficulty. Don't be afraid to ask them about their background and expertise. Remember you are the customer.
Payment varies - in the Midlands where I live it tends to be between £40 and £55 pounds per hour, or 50 mins, so not cheap.
Do hope you get the help and support you are looking for.