No, there is no loss of control. Hypnosis helps clients to become more focused in using their own mental abilities constructively. In this way, they can achieve anything they would like as long as they build the right motivation for it.
The subconscious has strong protection and at any time a client can re-alert or choose to ignore suggestions. No one stays hypnotized indefinitely – they will always “come out” of trance within a short time, like waking up from a very relaxing nap. If you are concerned about hypnosis you have seen on TV where people appear to do silly things or things they would not normally do, please bear in mind that your therapist is an experienced registered therapist whose sole motivation is to provide treatment and healing.