As our AB relationship over the years has, shall we say hostile at times, I was going to ignore your post, but clearly you are struggling.
In lay terms, the picture that you have given,both in symptoms and in investigations, would lead most people to concern at your relatively young age.
The sub cortical atrophy means that there is some degeneration the brain structure and the FTD must indi ares the position in the brain that this problem is occurring.
The enlarged,left ventricle sounds more serious than it is, as the pressure inside will almost certainly be normal and o cause for concern..
As for the cause of your problem at this stage it is impossible to say as is your prognosis and I would agree with PP that it is a matter of waiting and seeing..
There are many causes for your medical and mental problems ea h with outcomes varying from 2to 4 years and the more favourable prognosis
of living for more than a decade.
I am not a Neurologist.