Hope it's really nothing major. I've been thinking about that, but haven't gotten into my car innards in several years - so a bit out of practice. A lot of years ago while driving a car hard up a long grade (before check engine lights were a thing), the car suddenly lost power and really limped along until I could find a place open along the road. That turned out to be something (possibly a deposit that broke loose) hitting the plug and closing the gap completely. New plug and no problem ... old Ford straight sixes might not have been wonders in the performance area, but it was hard to really screw one up.
If you blew a head gasket, you should see steam or noticeable exhaust smoke (vapor). Not sure why hitting the rev limiter would cause a sensor to go bad, but could be something that simple. Honda engines are generally "interference type" ... something goes wrong in the timing sequence and valves have a habit of running into the piston. I'd think there would be a good indication if you had that kind of damage. It will be interesting to hear the story. Sometimes it gets weird and logic doesn't seem to explain anything.
My biggest PITA was a Mazda 626 the year before they went to fuel injection - a massive number of hoses and electrical connectors (something over 20 as I recall) to just get the air cleaner out of the way to do much of anything. That car blew two head gaskets because the electric fan didn't turn on when the engine was getting hot in traffic - learned to really keep an eye on the temp gauge and do the unthinkable which was turning on the AC to get the fan turning. I also had to put new rings in because for whatever reason the rings would stick in the grooves in the piston and the thing would smoke like crazy until it warmed up. That car and a Merkur XR4Ti were real teaching experiences ... and not of the good kind.
