Stress and POIS inflammation is litterally eating up the collagen in the lining in your gut (and everywhare in the body) and allow undigested food, fungus and bacteria to pass through. The best dietary measure is to let the intestines (and liver) rest from food during long times (between 6pm and 10am) and at the rest of the time only eat one food at a time to try if it works: fish, meat, egg, leafy vegetables, brown rice, bacon, protein powder. Take digestive enzymes, apple cider vinaeger and HCL-tablets to every meal and stay away from fodmaps, gas producing foods and sugars/starch. The first two days after POIS its probably best to drink smoothies or even better only water fast, with some addition of anti inflammatory supplements.
Take collagen, glutamin, aloe vera, bonebroth and protein whey powder (amino acids) to heal the gut and eat garlic capsules (not the fresh) and oregano oil to kill bacteria. If your gut is sick you have to treat it like a patient. Take calcium supplements if you end up with a hight meat-diet.
We POISers tend to spend much time in front of the screen and then we sit in a position that lowers the blood and oxygen supply to the brain (worsened by low blood pressure). Thats probably why it takes so long time for the headache to go away. The inflammatory substances stay longer time. Sit more straigt, do some yoga poses now and then, take walkes.
