Hello Leonard, I really appreciate you taking the time to think about this and write to me. You ask good questions. I don't have answers to them all, and I wish my doctor, good though he is, were more informative.
The story is that I had a large cyst in a part of the brain adjacent to the memory part in a ventricle. (https://en.wikipedia.org/wiki/Choroid_plexus. It brought headaches and memory loss. I never lost awareness of who I am, or faces, etc. but episodes of my experience would just disappear, such as having been on an overseas business trip with a colleague, promises made and before completely vanishing. Part of the diagnosis was WAIS testing, my score for working memory was very low. MRI showed a huge inflated cyst right in the middle of my brain.
I had the surgery, and the cyst was removed, and within days the WAIS test score was above average. But then over the following year, similar (I don't know if it was the same reason) amnesia would occur. Eventually, my surgeon said it was probable that I was having brain-only epilepsy. I have never had a full-body seizure or lost consciousness. A couple of months back he started me on Valpro, but I had a physical reaction against it, and then he switched me to Vimpat (Lucosamide). I have felt cognitively sharper on it over the last month.
I am 50 now, but I have never been suspected of having epilepsy previously. My understanding is that the cyst may have somehow affected the circulation of blood, and that vascular insufficiency could have brought on this epilepsy. The acute problem with the cyst happened about two years ago, but as time goes by, it is obvious that certain memories that should be there are gone, or at least inaccessible. The furthest back I have identified such missing memories is about six years ago. So my thought is that I may have had this form of epilepsy for a long time. What I don't know is whether the subarachnoid cyst exacerbated this existing condition or actually is the cause of it, due to disrupted blood flow.
Do people go through life with mild undiagnosed epilepsy and are just thought to be a bit absent-minded?
Anyway, from my reading, I thought I had TEA, but the doctor yesterday said TGA. Do you know if TGA responds well to anti-epilepsy medication?
I would really appreciate your insight! Your profile shows that you must know an awful lot about this.