You have two months to create a solid, detailed plan for the holiday break. I'd sit down yourself and with your therapist and bring a calendar. Write down what you'll do for yourself each day, what coping skills you'll use, what pleasurable things you'll do, how you'll reach out for help, etc.

You have two months to learn and practice better coping skills, skills to stay grounded, to feel safe. You might add in a transitional object from her, or have her write you a letter or a few to open while she's gone, etc.

So, while I totally understand you feeling afraid, I see a great opportunity for you to take control here and *make* yourself more safe, stable, happy.