@saskatchewanlady
I believe first and foremost you need to get your anxiety and depression under control since both may be causing memory issues. They can cause concentration issues that lead to poor formation of memories.
If you are having seizures you'd likely know it. If you're having tonic clonic seizures, you would end up on the floor or ground somewhere most likely be sore perhaps have a bitten tongue and/or cheeks, which would be very painful perhaps lose control of your bladder and/or bowels and sleep after. If you're having absence seizures, you may not be as aware of your seizure since you just stop doing whatever you're doing one second and a few seconds later or a minute you would just resume doing what you were doing previously with no memory of the incident so it's often difficult to tell unless someone can see you having one and may say you look as though your daydreaming, if you're having focal awareness seizures, you would be aware or perhaps have an episode of déjà vu, if you're having focal impaired seizures, you would lose consciousness most likely and if you had an aura prior you may see/hear/taste/smell things that aren't there or at least know somethings not right. But a lot of seizure medicines cause memory issues as well so hopefully your not having seizures.
ECT can cause memory problems also but I don't know if they can be permanent, they are usually only temporary.
What do the doctors say regarding causation? Have you had any indication of seizures? Had a brain MRI or CT or an EEG. Although seizures would probably be better diagnosed with a history. Half the tests for seizures are generally normal but normal tests don't rule out seizures.
Take care,
Jake