I haven't been in therapy very long so not sure I will be any help but I also had to change from a Monday to a Wednesday one week as my T was away. She also asked me if I wanted to miss a week or come in a few days later. I said I wanted to come a few days later instead of asking her. Maybe she thought by saying whatever she wants to do she was just suggesting what she thought was best. Maybe email or call your T and say actually you feel a bit anxious about missing a week and can you have the following Monday after all? I wouldn't worry about feeling needy .. I think a lot of people in therapy are and I am sure your T understands that. If you say you need to work the week after then does that mean you would then miss that week and feel the same as you do now?