There is a possibility that it is due to 'posterior vitreous detachment' where the vitreous gel separates from the retina. This can give rise to many floaters, which are very noticeable at first, but diminish as the gel moves further away from the retina and the gap fills with fluid. PVD's are common and are as a result of age, not diabetes (as far as I know). I've had this in both eyes.
If you get a distortion in vision such as a vertical line appears to have a wobble in it, then it may be an epiretinal membrane, I've got this in one eye and it is due to diabetes.
My advice would be to ask for an ophthalmic examination, with iris dilation and also an OCT scan. If the waiting list turns out to be very long you may be able to find an optician equipped and experienced in such things. I am fortunate in that there is a local practice who are qualified for this type of work (privately owned, not one of the chains) and I was seen within a week.