I did my student teaching almost 2 years ago now. Been through a year of subbing and still looking for a job.
Anyways.....my experience was very stressful. I did 8 weeks in a Kindergarten classroom in one district and 8 weeks in a Multi-age 1 and 2 classroom in another district.
My first 8 weeks was hell on earth to put it nicely. My teacher never allowed me to make a connection with the students or even take the class on my own. She was always there, looking over my shoulder, criticizing my work, etc, etc..... She barely even spoke to me outside of the classroom, i.e. lunch, after school. I think I went home crying almost every single day and stopped at Starbucks every morning because it was what got me through the day. I wanted to quit by week 7 and ended up calling the director of student teaching and my supervisor telling them that I didn't want to go back and that I'd rather fail. They allowed me to get my final and take week #8 off before heading to my next assignment.
My second 8 weeks was the complete opposite. My cooperating teacher and I got along so well and I also had other student teachers in the building with me. (I was alone on the first one) She allowed me to do whatever I wanted and felt comfortable enough to leave the room whenever she wanted to get some other work done. She was absolutely wonderful! I ended up passing with flying colors and wanting to teach again.
Good luck with your experiences. I always pray that no one has as bad of an experience as I had but make the most of it if you do. I learned a lot about myself within those 8 weeks and throughout the weeks following it.