Diplopia:-mri brain isch chngs & infarcts now thirsty esp at night & constant salty taste in mouth. could mini stroke be cause or taste disturbance ?

Multifactorial: This sounds quite complex. There are many factors involved in your question. You describe different brain and nerve defects as well as significant abnormalities on the mri. This sounds like multi-focal and multi-factorial disease. Diffuse vasculitis can cause multi-focal infarcts that can produce disturbances in vision and taste and thirst. You need a thorough neurological evaluation.