1. feeling sexually attracted to anyone is normal. It is a feeling. Feelings cannot be controlled. Your actions on those feelings, however can be controlled. Only if you acted on these feelings would it be a problem. I'd suggest talking to T about them so you understand WHY these feelings are so strong.
2. fear of abandonment is another issue you and T can dive into. I'm guessing she is not the only person in your life you've had this fear to. have you ever been/felt abandoned before?
3. She can't fire you. Only YOU can fire HER. you're paying her, remember??? Therapy will only end when you both have mutual agreement to, and/or you have proper closure.
take care.