Focus on doing what you can to realize your goals. The more you are in tune with what you actually want to do(and the subs are supposed to help you get there), the less recon you naturally experience. If you run a seduction sub and don’t focus on seducing women every day, you’ll inevitably get recon.
I find that I get little to no recon if my intent throughout my day is fully focused on that which the sub is supposed to help me with. Unless we’re talking about heavy healing subs like Dragon Reborn Stage 2. That still hits like a truck even if you are focused on healing for most of the day.
In my opinion, if using the subs actually do induce headaches for you, it is a sign of your daily intent/focus being at odds with what the subs are suggesting to your subconscious, hence the friction. Align, and the recon/headache will disappear.
Work on these things before you consider sweets or chemicals. If you’re not chronically undernourished, sweets and the like simply seem to brush over the real issue, which is that your mind needs to become more receptive(through open-mindedness, which you get through questioning your beliefs), that you need to lower the input(loops) and that you need to align your actions with the sub.