The symptoms you describe are the same for a myriad of ailments. The fact that you flew just prior to the symptoms appearing could be a coincidence, or it could indicate another cause for your ills. Aircraft cabins are highly infectious environments. I've gotten sick from flying on airplanes, but it had nothing to do with Aerotoxic Syndrome and everything to do with the germs from other passengers that I encountered, which most often led to a bout of the cold or flu. I guess the question would be if anyone else from your flight is suffering from the same symptoms. But, of course, there's no way to find that out. And until/unless you do, this is a moot point, especially since Aerotoxic Syndrome is somewhat of a dubious ailment (at least it's not officially recognize by the medical field from what I know about it).
My other home is in the sky inside my Piper Cherokee 180.