Getting Ready for not going back to school and surgery

I was doing really well the other day.  I got a positive note from my therapist.  Then I went out to  see my grandparents. They said with me being on the Prozac that I could just up and kill someone.  Also, they told me that seeing a rhumatologist is not a good thing.  They were just so negative.  I am also really scared about my surgery.  I am not going back to work as a teacher on Wednesday and it is driving me crazy.  I am so depressed.  My psych says that I am not bipolar and that I am just in a deep depression.  Maybe everyone is right and I will never get better.  Today is a very low day for me.