When I go without medicine its not by choice. Its usually because I don't have access to anything to abort the headache, or have already taken my limit for that day. One of the worst was earlier this year on a walk. I frequently take multi hour walks for stress relief. I was about an hour down the trail when the headache came on, I had forgotten any medicine and had no choice but to walk the whole way back with the headache. It finally broke about the time I got back to my Jeep and it was certainly a rush when it broke like glass and the headache was gone.