First and foremost, please consult a qualified medical professional if you’re having things like this occur, just made to ensure that your health is in good order. If it continues, please case use of the subliminal.
As for my thoughts, which isn’t a professional medical opinion, or medical advice:
I believe it’s a stress response. People don’t realize that you have neurons all over your body, including your heart and stomach. That’s why stress can upset your stomach or make your heart have sensations — they’re directly connected to your brain.
It means there’s something in those scripts that causes a lot of subconscious stress. If you can figure it out, you can consciously overcome them.
The next time you feel this, grab a pen and paper, try to mine your subconscious and see what’s causing the recon.