Hi Stonewarrior,
I salute to you; you are indeed a warrior in life.
Floaters need immediate medical attention of an ophthalmologist because of the risk of the severe retinal detachment, which can cause vision loss. However, there are other causes of floaters which are less severe.
The shapes of floaters vary, with effects such as spots, dots, wavy lines, cloud-like shapes, spidery-webs, and other variations. There may be one large floater, or many smaller floaters, or any combination. Floaters may be caused by opaque substances (e.g. blood) floating in the vitreous or from problems with the retina.
Floaters are often associated with visual flashes, where the person sees flashing lights or sudden pulses of bright lights.
Causes of floaters can be Short-sightedness, Vitreous detachment - commonly occurring with aging,
Posterior vitreous detachment (PVD) - commonly occurring with aging, Retinal disorder, Retinal damage, Detached retina or Diabetic retinopathy and also Hypertensive retinopathy.
I think you should see another ophthalmologist and take a review opinion.
Alternatively you can also meet a neurologist and get a review scan done.
Hope this helps.
Bye.
Have you considered migraine? I didn't know until recently that we can have a migraine without the headache pain. I sometimes have no pain, but see sparkly lights flashing for a period of about 30 minutes. In my case, this is followed by my usual migraine aftermath - fatique and sometimes nausea. I think you should see a neurologist.