Hopefully it goes well

Maybe you're just on a medication that doesn't work for you. There are several different types of antidepressants out there... SSRIs, SNRIs, MAOIs, tricyclics, atypicals, etc.. Each type of antidepressant targets a different mechanism in the brain. So, maybe you're on a SSRI and it doesn't work... That means your depression might not be due to serotonin issues. You could try a MAOI instead (for example).

I would talk to your doctor about trying a different class of antidepressants. If you're taking an SSRI that doesn't work (for example), then other SSRIs probably won't work either.