Hey, Invyzabul, your post would have been answered long before now if you were on the MS forum. You're asking lots of good questions that our members would be helping you with. I don't have the knowledge to do that, but please try reposting to that forum. Good luck.
Small vessel ischemic disease is also known as white matter disease. This is usually seen in patients with history of long standing headaches, migraines, strokes, diabetes, High BP, history of smoking or alcoholism and also aging.
I would suggest you to get yourself screened for risk factors for stroke because there is some evidence that patients with small vessel ischemic disease are at an increased risk for strokes.
Therefore it is important that you ensure that you keep your BP, cholesterol, blood sugar and body weight under control.
The chances of dementia are more if the brain damage continues and there are large infarcts in the brain.