Floaters are completely normal and everyone experiences them, they are caused by broken down cells which float around within the jelly contained within you eye, which is why you are able to flick them around with your eyes. Floaters are completely harmless and nothing to worry about, they can appear as single bubbles, strands, etc.
I have spoken to many people regarding the subject of eye problems that many of you (including myself) experience, and I personally think that everyone has these experiences, its just that an anxious person is much more self-aware and hence is more prone to noticing things (how many times have you spotted something in a similar place since having this condition that you have never noticed before?) and now that you have noticed these things it is very hard to unnotice them (a bit like the old saying that if someone asks you to NOT think about a pink elephant, it is very difficult to do this).
Also do not forget that anxiety and/or medication causes your pupils to dilate and this will cause grainy vision/longer after-images/light-sensitivity, for example, when you sit in a dark room and look through your eyes you will see that it looks grainy, this is because your pupils dilate and hence you see abberations from the eye surrounding the pupil, normally during daylight, bright light your pupils will not dilate, however with anxiety and/or meds your pupils stay dilated and hence you see these aberrations.
Just try not to worry about these so called problems with your eyes as they will settle down once your anxiety subsides and/or you come off your medication, as mine are currently doing so, although some days are worse than others but I rarely even think about it anymore.