Hi CZ,
Welcome to the forum! What you are describing sounds like you might be having either a complex partial sz. or a myoclonic sz. When I have a complex partial sz. I get a funny feeling in my stomach and then I start to see colors flashing back and forth in my eyes, then I blank out but I will walk around the house and continue doing things I just don't remember. What I find interesting is the time you have your sz. a person who has myoclonic sz. will often having them when they first go to bed or right after they get up in the morning. You might want to see a neurologist or better yet and Epileptologist and have an e.e.g. and MRI done to be sure when you hit your head it didn't cause any problems. check out this website for more info. on sz.
http://www.emedicine.com/neuro/index.shtml#seizures check out complex partial and myoclonic seizures to see if this sounds familar to you.

Also check out www.epilepsy.com

Here's wishing you well and May God Bless You!

Sue