In 2005 I was put on Humulin because supposedly Actrapid was no longer being made. I was told by my diabetic doctor to take the same amount of Humulin units as I had been taking for the Actrapid/Monotard.
The next 2 years were a living nightmare. I would slip into comas during the night with no warning, my husband became very practised at injecting glucagon. I had no hypo awareness at all and would come round all hours of the day not knowing what had happened.
During this time I was losing my memory, couldn't remember simple words in a conversation, couldn't remember what I had done the week before, things that I could vividly/easily remember before the insulin change.
Then I met the DAFNE team who let me know there was no way I should have been on the huge amounts of Humulin insulin that I was taking for the amount that I was eating. The memory loss is caused by lack of sugar getting to the brain, yes the brain needs some form of sugar as well as all your body cells.
You need to see if you can stop the hypos, 2-4 a day is not good for you or your body. You must be taking too much insulin against the carbohyrates that you are eating? I would urge you to contact your diabetic nurse/team/doctor and find out what is happening
Does your memory come back once your blood sugar levels out though?