How would I know if I have been hypnotized?

It depends on the individual. Some people may not feel or realized that they were in trance after the session. For some, they may be more aware of changes felt in their bodies than others. You may experience sensations such as weightlessness or floating, heaviness, tingling sensations, or just pleasantly relaxed.

Nevertheless, whether you consciously knows you were in trance or not is quite irrelevant as the desired changes will become apparent over time, perhaps in a few days or weeks. The effect can be subtle or immediate, depending on how amenable for change your unconsciously mind is during the therapy session.