Afriend of yours has a sudden onset memory loss and also doesn't seem to be able to make new memories for a few hours as they keep asking you the same questions repeatedly. what kind of amnesia is your friend suffering from?

He is suffering of  Transient global amnesia , anterograde and retrograde amnesia.

Explanation:

Transient global amnesia  is sudden and temporary loss in the memory. As the people having this problem can not store the new memories  and it can not be related with any common neurological problems.

anterograde amnesia is the loss of  patient ability  to create new memories after the event  due to which amnesia occurs which will result in complete inability to recall the recent past event and memories.

Retrograde amnesia is the inability to recall past memories