I noticed my first floater a few months ago. It just so happened that in that same eye I had an ulcer a few weeks or a month before I first noticed it. I'm not sure if that's what caused my floater, but if it was I would think I would have noticed it right away. I wonder if it has more to do with the fact that almost a year ago I started on both anti-depressants and Centrum Performance (and Cytomel for my underactive thyroid). I agree with you that after reading some of these posts I wonder if the meds or various vitamins I'm on could have contributed to the floater. Luckily I only have one, but it's fricking annoying to me no end!