The treatment is not permanent. The effect where off. What does not go away, was likely there before the botox. Unfortunately you did not provide photographs of what you looked like before any treatment.
Thank you for sharing your picture. Probably they used too much of Botox on your forehead and now you feel profound heaviness on your upper eyelids. One solution to offset this problem is to make sure that glabella(muscles between your eye brows in the middle) and crows feet are going to be injected with Botox to counterbalance the muscles of forehead.