thanks for the reply. well said! >>...the safety of batches of LSD cannot be verified >> thats why I said "No thanks" a tousand times on festivals. I worked as visual artist on many of these psychodelic open air like BOOM 4 times, and similar all over the globe. I saw a lot of really bad messed up people too, not my direct friends but just really "lost souls" unable to find their homebase - no passport - no tshirt - no nothing + completely tilt.
BUT i found a medical article maybe to add here on the headache topic. http://journals.sagepub.com/doi/full/10.1177/0333102410363490 Have a great day!