Hi I am a Hypnotherapist, so I thought I'd add my input! Firstly, I can't stress how important it is to choose a registered therapist! Sadly (at the moment) anyone can call themselves a Hypnotherapist, regardless of training (if any), or insurance, or CRB checks etc. Hopefully, this will change, and we will HAVE to be registered in order to practise. This would be good all round, as the client will be protected (we work from a strict code of ethics, and must be qualified and insured), and it will also 'weed out' the charlatans who see hypnosis as easy money.
Hypnotherapy is actually the fusion of Psychotherapy and Hypnosis, and for Sophiedotty, the results she experienced were classic symptoms of the Psychotherapy portion of the session either poorly executed or non-existent.
Hypno-hypno - the phobia issue should really be wrapped up in around three sessions, not ten (obviously I do not have all the facts, but ten seems extreme for a phobia!)
NotYoMomma - ten to twelve sessions would be typical for deep-rooted anxiety/depression - and plainly your therapist had received proper training, and understood the process completely - good for you!
So, my advice, in a nutshell: ONLY choose a registered therapist (either National Council of Hypnotherapy (NCH), or one registered with the Complementary and Natural Healthcare Council (CNHC)) Or, preferably both! You can then be sure that your therapist really has your best interests at the core of his/her work, and you have some recourse if you are not happy.
Like I say, just my two penn'orth - if you wish me to clarify anything please ask