Back to work

So, I just had my spinal fusion on October 15th.  I have been active doing things in the home and running errands.  I work as a substitute teacher and tomorrow is my first day back to work. I'm working with the kindergartners tomorrow.  I'm a little nervous, but I'm hoping my pain wont be too bad with some Aleve. I'm kind of nervous to take an Oxycodone before work.