This is kind of complicated. I've done some research into retrograde amnesia, but I haven't found exactly what I need. It's possible that's because it doesn't exist. . . .

So. Modern day, London. Character (late 30s) is thrown from a two-story building and receives a skull fracture and a couple of broken bones. He's rushed into surgery to stop the brain bleeding and he's in a coma for a couple of days. He wakes up thinking it's 4-5 years earlier. He recognizes old friends and family, but not anyone he's met recently. So far, so good, right?

Question #1. In the UK, London specifically, how long would someone with retrograde amnesia be kept in the hospital? Just until his head wound heals? Would he be put in a care facility or group home setting for observation? Or would they just send him home?

Question #2. He's not a doctor, but he is a genius. Is it feasible that his intellect remains intact after the head trauma? This seems to be okay, based on what I've read, but I'd like to be sure.

Here's where my plot starts getting iffy. In those missing four years, this guy basically went from being a rude, inconsiderate, arrogant SOB to someone who actually cares about other human beings. Lots of character development, which all vanishes when he forgets. So there's some conflict with friends who no longer put up with his crap. Eventually, he decides he needs to fix his brain.

Based on the premise that certain neurons in his brain that connect to memories are either misfiring or damaged, he decides electroshock therapy is his best bet. His doctor friend strongly advises against this treatment, especially since it's not proven to help amnesia (as far as I can tell), but he, being an arrogant know-it-all, goes ahead and does it, on his own, sneaking into the hospital. Afterwards, he stumbles around in a daze, finds his friend, and then has a major seizure.

Question #3. Would electroshock therapy trigger seizures? If so, would seizures be a permanent side-effect? Or just a one-time thing?

Question #4. Is it possible that the electroshock treatment actually does cure his amnesia, at least in part? If so, could it be psychosomatic, like a placebo? And if it does work, would it be an all-at-once recovery, or more like the memories slowly trickle back, over time?

Question #5. I know the "bump-on-the-head cure" is cliched and totally inaccurate. Is there anything that might actually work? Even accidental or partial? Like, kissing his fiancee, someone he doesn't remember, and having flashbacks to their time together? Or even spontaneous recovery for no apparent reason?

That's all for now . . . thanks in advance!