Hello. Thanks for asking from HCM. I can understand your concern. Protein powder intake can cause headache if it is taken in excess and impairs nutritional balance, leads to gastritis, allergy to powder or you are using powder which is of poor quality and not FDA approved. Kindly look for above mentioned causes. Avoid self medication on regular basis. Paracetamol is as such a safe drug but excessive use can damage your liver. If your headache is occurring on regular basis, you should get your eye check up done to rule out poor eye sight, get Blood pressure check to rule out hypertension, consult neurologist to rule out migraine etc. It seems that you want to gain weight. Avoid using any type of supplements or steroids on your own. You should consult expert Dietician who will advise you proper diet according to your body weight. Based on Dietician recommendation, you can use diet supplement. Thanks. Hope it will help you. thanks.