WoW! You're a busy boy. Kinda makes you wonder how you got Type 2. j/k Over long-term lows(I mean Really low and even seizures)it may cause some loss of short-term memory, concentration, and short attention span. I've also heard some damage to the vessels and possibly Neuropathy. I am still looking for written evidence of that however.
I agree with what Terrie said. I have read reports like that many times. During my 62 years of diabetes I have had many lows and sme seizures too. I definitely have short term memory loss and I have a lot of difficulty in concentrating on something. I am also 68 though so some of this may be caused by aging in my case.
I would think that the brain will suffer as firstly that you cannot think strait when you have a low event so can we say that the brain will have some sort of permanent damage if left low for a predetermine time. That's just my thoughts though.