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.
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.