I hope there's no complications with your surgery tomorrow. It's good to hear your meds are reducing the intensity of your depression.
In regards to the medical personnel seeing your scars, I hope they're all professional and will not treat you any differently than before. I see it as being very unethical if they say anything about your scars to anyone who does not need to know. I think it's very messed up to be put in the situation where you have to choose between living with excruciating pain and being stigmatized by the people around you.