I have already answered this , but you ask if this could be downgraded to ABH. If he knocked you unconscious that GBH it will not be downgraded.
The time you say 'I was not hurt after the knock on the head except for dizzieness brusing and nausea' means that attack was also at least ABH and you WERE hurt as you describe concussion. The times he threw you on the bed and when hit you 'on the same side of the head' are all asaults. I make it 5 times he has assaulted you from what you say in this post.
He should be being charged for all 5 !.
Please phone the help line I gave you , they will help with the legal side and help you cope with it all.