Got my bisalp this Wednesday and I am terrified sick, please help

Next wednesday*

I keep having intrusive thoughts about being looked down on while laying on the bed and being opened up, have stuff taken from me and being stitched up. I'm scared of feeling sick or in pain or have complications after. I don't even know how long I'll have to stay there, they haven't told me yet. Is there anything I can do? Any way to psych me up? Even blood test freak me out, let alone this. This is my first surgery ever. But I don't want to take the pill and risk forever. Thank you so much...