Any links between dry eyes, blepharitis, floaters and possible diabetes?

No not really: They are separate entities but diabetics may be more prone to retinal problems and floaters may be an indication so if a diabetic has more floaters they should see the opthalmologist. The drye eyes and bleparitis do not really relate to diabetes or floaters.

Dry eyes: Dry eyes and blepharitis are certainly related. The rest of the symptoms are generally unrelated. If you have known diabetes and known diabetic retinopathy, new floaters could mean a bleed in the eye. See an ophthalmologist who will be able to check for these conditions.