From what you say you have been on anti depressants in the past. You say they gave you a zombie feeling. I think that is because you were not on one that suited you. I was on an anti depressant for years, in fact I have been on many, but I have not felt like a zombie. Perhaps your doctor could prescribe a different one, that suits you better.
I hope that the response in the other forum helped you a little. It is unlikely you have an STD so it may just be a medical problem. Don't worry about it for now, just get it checked out.