Very similar situation to mine (history of depression, benefited from meds in the past and back on an SSRI (zoloft) now).
If you benefited from being on an SSRI before, seems to me it would help now. To me, the risks of being on medication are outweighed by the risks of being severely depressed (I was feeling suicidal, etc.).
After taking zoloft for 3 weeks I'm feeling a lot less desperate and despair-y, not awesome but I think it's helping.