2-cb and SSRI HELP!

I have a question because I regularly take an SSRI called SERONIL (30 mg). I was given a 2-co dose, but I only took a quarter, even though I was already drunk. I really enjoyed the experience, but I read about serotonin syndrome and that it can kill. Will taking a quarter, like last time, or a half with less alcohol, harm me? Could someone help and shed some light on the topic?