Keep that blood sugar tightly controlled! Best way to help prevent further damage, and don't forget blood pressure too although I'd be surprised if you had hypertension at such a young age.
Have you been referred to an opthalmologist for further investigations? Nothing to worry about, but will give you more information as it involves a more detailed and interactive examination of your eyes. The black floater you see is normally a symptom of a retinal bleed - I've had loads of them over the years - which suggests more than just background retinopathy. However only an opthalmologist taking a good look at your retina will be able to tell you.
A rapid improvement in blood sugar control can sometimes lead to a worsening of retinopathy before any improvement is noticed, certainly the case with me. But you CAN get through it and out the other side with better vision and stable retinas. I've had stacks of laser treatment, which although is not a cure, shores up any damage already done. Your job is to prevent further damage taking place by virtue of your new regime and taking better care of your diabetes!