Hi p8d!
In my opinion, catecholamine surges happen at the same time everyday around 4pm because cortisol levels are reaching their lowest point of the afternoon. In your body's attempt to create energy because there is low cortisol, (cortisol instructs the liver to start gluconeogensis for energy) your adrenal glands release epinephrine to instruct the fat cells to release glycerol and 3 fatty acids for energy, hence your "Clockwork Adrenaline Surges". In order to prevent these surges eating low glycemic fruits like apples, blueberries, raspberries, strawberries may help, before the low cortisol dips, which generally occur at 10AM, 2PM, and 4PM.