Please try to be as minimalistic as possible with your designs. It should be a simple, yet remarkable logo which can be drawn in the sand with your toe.
Please have a look on the bad and good examples I uploaded.
Those examples should give you just some idea for the design language.
Don't copy the ideas from the example.
Some more help for inspiration:
Language is the most important part in hypnotherapy. The dialog between the therapist and the patient form the results. Being in trance (=being focused inwards to your body) is a very important step. The therapist helps the patient to find his own solution with his own resources. A big part of hypnotherapy is telling inspirational metaphors and stories. Maybe this can give you some more ideas. Thank you for your time!
Things to avoid:
No letters for the symbol.
No complex graphics.
No typical swirls.
No sharp edges.
Please use maximum two different colors.
One black & white version of your logo would make it easier to compare.
Don't waste your time right now on different type selection. The symbol is the important part.
Don't upload horizontal and vertical versions. One version is enough.