With this history you need to see an Eye MD ophthalmologist, ideally one specializing in retina/vitreous to look for holes/tears/detachments. If you have not done that do so. Some floaters settle on the bottom of the eye out of the line of sight, floaters made out of red blood usually dissolve in 3-4 months. The vitreous liquifying is a normal part of aging and not in and of itself a problem.