Yes, because these are normal human emotions.
I urge you to talk about this worry with your T, including the feeling of dread that the good feelings won't last and the desire to try to be T's best client. It's something important to learn about you.

My T told me at one point "I won't always tell you what you want to hear." It was kind of scary to hear at first, but I realized it also meant that she was going to be real and she expected me to be real too. That includes the full range of my emotions and my honesty.