What causes "blackouts"?!

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Do you mean blackouts or do you mean floaters, where you get black spots floating about in front of your eyes? If you mean the latter then it is caused by debris on the back of the eye, but get it checked out at the opticians in either case just to make sure it is nothing more serious.

I have had floaters for about 2 years.

Does this ONLY happen when you are changing positions? For example, when you stand up from a seated or lying down position? And as soon as you stand, everything goes black for a second or two? That would be called benign positional hypotension, if everything else could be rules out medically. What BPH means is that it is benign (or not dangerous); that it's related to the change in your body's position; and hypotension means that your blood pressure drops to a level which it cannot recover from as quickly as your position changes. It can be related to other problems, so you *do* need to see a doctor, but, first things first, start getting up much more slowly. From bed, sit on the edge of the bed, then stand. If you are sitting, give yourself a few seconds before standing all the way up. IF it happens when you aren't changing positions, and you're NOT on meds to lower your blood pressure, or that have that possible effect, this could be a sign of sight problems or neurological problems, even heart issues.

I have BPH.

terrorists caused them to keep us on our toes lol