Nothing's wrong with you, you are having a very common reaction. All the more likely when your understanding of your last treatment was a bit out. Your visit next time will be appreciated just as much. Many people experience a sense of anticlimax, a lack of focus now that the doing is done, and a loss of being part of a team. Elation will come but for many it doesn't come straight away. You are finished treatment, but not healed. Be kind to yourself, don't expect too much too soon, you have taken the hard medicine but you still have a ways to go. Some time spent looking after your emotions and your energy will be well spent now. Take care.